[wolfi1]

could be, but for pdf documents I would assume that they are not changing this much

[crote]

TI usually links to chip datasheets, which do tend to change from time to time. Having both a reference to a specific revision and a trivial link to the latest revision is quite handy in practice.

[Lex-2008]

timestamp corresponds to Oct 08 2025, so probably the last time the file was modified