Pixel/Google does not motivate a threat model under which to evaluate or understand their design and marketing promises, but we can take a hint from "protects your data if your phone falls into someone else's hands." - Namely thefts of opportunity. Unlike other phone manufacturers, Google does not promise potential customers that your data will be protected from Google, it's partners and from law enforcement and mass…
Apple is just putting on a show with their tough security rhetoric, they can't resist the US government if they really want some data.