I’m guessing here, but are any of those products on that website both purchasable AND given a guaranteed product support time? Or to make it more specific, has Google ever killed off a phone (Nexus and Pixel years, so 15 years total) prior to its end of support date?

I don’t believe they have. Stadia, a non-phone product, is the closest thing. Of course it’s not a phone and Google also didn’t give a eol date before its release. When it was killed they refunded any purchased games. So I guess the better question is would you be fine with getting a refund in the amount of your purchase of a Pixel 8/Pro if they didn’t hold up their end of the bargain?

I know some of the comments in the community are tongue-in-cheek, but if Google were to keep the prior support date or do what they did today by increasing them, folks still wouldn’t be happy.