I’m going to post the unpopular opinion here and say that this is OK in my book.

This archive is distributing out of date documentation without making it clear that it’s out of date. This could cause a major problem for someone that uses it.

The documentation for the same chip is perfectly available on TIs website, although to get older datasheets you’ll need to dig further (by design).

There’s a ton of sites mirroring datasheets, and they weren’t DMCA. It looks like someone at TIs legal got creative about how control this sites to update their info.