Exactly! That's why we assume these things, because thats how the people who hired him think. I am glad we can all deduce this from looks and a few lines of words. We know everything about this entity.
I already pretty much covered the entirety of this by saying "correlation without causation", from which you surmised "we can assume", which you then leapt to "we know everything about this entity".
First, these developers actually do have handbooks and advisors on this stuff, with the intended goal being to reflect ideologies in games and virtue signal in front of a camera. This isn't just known from passive observation, it's known from factual information of leaked documents.
Despite this, it is still correlation without causation to assume that, in this one specific instance, everything will go this way. It's simply an informed prediction based on known facts, history and observable patterns. Any pattern can have a break in it, that does not keep you from recognizing the pattern.
For example, if the first game in a franchise is great, but then the director leaves and the next 2 are duds, and then returns as director and 4 is great again. There is an observable pattern to the outside viewer that if the director leaves for #5, it will be in trouble.
It's REALLY correlation without causation: the past games may have had other issues beyond the change of director, and the new game may the best of all without him. We simply don't know, we just make assumptions and predictions based on what we have, which is what we do EVERY SINGLE TIME for everything in life. So if the past 50 games that made you roll your eyes had a team of blue-haired people, then blue hair starts to set off alarm bells.
To think I used to like blue hair. Goth/punk girls! Sometimes good things get ruined because they're associated with something negative. Look at Hitler's mustache. I'm pretty sure not everyone with that look was a dictator but it got ruined anyway.