That's a very strong claim you're making there. Do you not consider mixins from News and YouTube to be "web pages"?
I've also worked at Google. Things that are clearly the case:
1. There are blacklists of certain political query completions on web search, like "hillary clinton emails".
2. There is a controversial query blacklist on YouTube with political content. Go look at the file in google3 if you really think the screenshots are faked:
https://www.projectveritas.com/2019/06/26/blacklisted-leaked...
3. Google News is quite clearly blacklisting Breitbart from ranking: it's indexed but in many years of using Google News I've never once seen it be selected. The Guardian, on the other hand, routinely makes it into nearly every selected story.
The writing is clearly on the wall for you. Whether organic web index results are reranked politically or not, and for what it's worth I believe you for that specific subset of the system, other teams in the company that didn't inherit the same culture are doing politically motivated things with the full knowledge and acceptance of the executives. It's only a matter of time before web search falls to that new culture too.
And when it happens you probably won't even realise it. Some team you've never heard of will quietly adjust a machine learning model in subtle ways you'll never detect, to "debias" it in order to yield "better outcomes".