The Google IPs might be because SpaceX and Google have agreements where Starlink downlinks can use the network connectivity at Google data centers (and vice versa)?
Google paid for Starlink. It's their loon replacement
Are you able to substantiate that claim somehow? I know SpaceX has a commercial arrangement to pay Google for services used to deliver Starlink, I'm not aware of anything close to "Google shut down Loon; Starlink is the replacement; Google is subsidizing/funding Starlink".
I'm not the OP but I also heard rumors that Starlink bought Loon IP specifically the LTE stack. Given that we know Starlink was using the Google network in the early days and Loon was officially shut down months after Starlink beta started, it's not hard to imagine that there's some partnership.
Maybe they meant that google invested to the tune of $1B back in 2016 making it one of the largest spacex investors.
Google invested 900 million into starlink & shut down loon around the same time. There's tech from Google in starlink. Starlink uses Google cloud. In fact starlink used to show up as Google Fi. They now have their own network.