It's good that Verizon says the phone is carrier unlocked, therefore it can be moved to another carrier. It's also good that Verizon says they won't "stand in the way" of updates. However, what really concerns me about Verizon handling the OS updates is what happens to that process if you should decide to move your phone to another carrier? As your phone would no longer be connected to Verizon's network, how would the phone receive its OS updates?
In the articles I've read about the Verizon Pixel phones, nothing has been said about how updates would work if/when the phone were moved to another carrier. I am not so trusting that I would risk presuming that somehow the phone would automatically start receiving its updates directly from Google when it could no longer get them via Verizon. After all, the bootloader is indeed locked.