Incorrect. Google's culture has shifted. Culture-wise, Google is closer to Oracle than what people think is Google.
20% hasn't been a thing in Google for a long time. Exists only on paper.
Source: I worked at Google when we all got the memo that all information access within the company is now on a need-to-know basis, and that accessing information that you don't need to know for your job is a fireable offense.
Default level of sharing technical documentaiton is fully private, so tech docs are not searchable in company search engine (read this again).
Good luck re-using the code without design docs. Also good luck starting a project if your team doesn't own the data.
Hot take: Google doesn't have a strategy, period. Neither copmany, nor product.