The question is moot because Google is so far away from the inception of the company.

These guys ran their first company for 1 1/2 years, then went full-time and seemingly focused most of their energy on this new product.

This is basically a pivot or new product. There are lot's of ways to frame this approach which are analogous to 'properly' bootstrapping.

Well clearly not since they are a publicly traded company and have received millions in venture capital.