For it to be government censorship, they'd have to use government power to censor. No formal power was used. It's also not urged by the federal government, which is the organization that Trump runs, but instead by elected representatives.

I also think it's misleading to call it partisan, as if truth and falsehood are just two different flavors of ice cream, or two different sports teams. An informed populace is a necessary precondition for democracy to survive. Google might have the right to profit from misinformation, but I don't think they have an obligation to do so. They are allowed to support free and fair elections, just like the rest of us.