Why does Google use deprecated tags?

Question

HTML

Here is an example tag <center>.

People from Google took an active part in the development of the HTML 5 standard. So why do they use deprecated tags that they themselves "rejected"?

Answer 1

Because they have to support older browsers that don't know about HTML5.

Answer 2

because they can) and in the end, this is a working page, and not some kind of best practices example.