Why does no-one recognise Bernard?

(I'll just copy/paste my answer from the SFF question here.)

After Arnold's death, all records of him were purged by Delos. Most people don't know who he was, much less how he looked. There is only one photo of Arnold remaining: The one Ford keeps with him as a memento, which he shows to Bernard early on.

In episode 2, Logan mentions a founder who died in the park, talking about his death as if it's a myth. He doesn't know the founder was named Arnold, and his lawyers looked thoroughly through Delos's records, and couldn't find any proof of Arnold's existence or death. If we believe the theories about multiple timeframes (which I certainly do after the two most recent episodes):

This conversation probably occured about 5 years after Arnold's death, and he was already mythical and forgotten. The "present day" is then 30 additional years after this.

The simplest assumption, then, is that nobody currently working at Delos has worked there for 30–35 years, since otherwise some things would easily come to light. I can't recall seeing any employees there who are old enough to have worked there that long, either – except possibly Theresa if we stretch assumptions a bit, but we know she hasn't been there long, although she does know about Arnold (she mentioned him in her lunch with Ford, if I'm not mistaken).

So it does seem that Delos, prior to being bought out by the Man in Black (who also knows about Arnold, but he learned about him from the hosts, who retain knowledge about him through the programming he did), did succeed in scrubbing Arnold's existence from their records, and that Ford is the only remaining employee from that time.

Until they answer this it just seems like lazy writing in service of an (admittedly great) twist.

Even though the show says Arnold's involvement in the park was concealed after his death, there's a lot of people who seem to know about him. Logan knows about him as does Theresa. Ford mentions that his "business partners" scrubbed Arnold from the records which means that at least some people in Delos knew who he was and almost certainly what he looked like. It's pretty hard to believe that none of the important people from Delos dropped in for a visit and noticed that there was a robot version of Arnold running around.

Sure, Arnold died a long time ago and yes Delos did their best to scrub all elements of his memory from their records. Nevertheless, it would take a lot more than that to remove someone from existence. Based on the flashbacks, it seems like the park was started AT LEAST in modern times if not the near future. It's kind of hard to believe that a person wouldn't leave anything behind even if they aren't big social media users. Perhaps Arnold grew more reclusive but there's nothing to indicate that he was a virtual hermit who never left any evidence of his existence.

Do we really think there wouldn't be a single press release of Arnold in his early work in AI/robotics? Or maybe a faculty/staff picture when he was getting his degree or teaching at a university? Ford often acts in such mysterious ways that I can't really buy that no one there ever decided to Google his mysterious partner or the early days of the park.

The plain answer is that, with the knowledge currently available to the viewer, it is a glaring plot hole. No information has been offered to explain why Bernard doesn’t “rotate out”, nor to explain why no-one recognises that he looks identical to

Arnold

However, the story is still ongoing, and the disjointed timeline of the show would easily permit an explanation being introduced in a later episode.

For example, it’s plausible that

everyone else knows that Bernard is a host, but that each time he finds out, he gets emotional enough to affect his productivity for a few days, so there’s an unspoken understanding that “we just don’t mention it”

Being that Barnard is controlled by Ford, I interpreted the necessary out of office times to be taken into account by Ford.

For example, during weekends/holidays, Ford may order Barnard to deactivate inside his living quarters.

Who would notice if he actually entered the park or not through the official exits and entrances?