So Either
1) Linus Torvalds is asserting he is Satoshi Nakamoto, inventor of Bitcoin.
2) Someone hacked Linus’ GitHub account.
3) Someone used a technique on git to change the author and claim they are Satoshi.
IMO: Most likely is 2 or 3.
IMO: Most likely is 2 or 3.
2b) Someone is using GitHub trickery to display a commit in another repo as belonging to that repo (see other comments), without actually compromising any accounts.
4) Linus decided on a funny name for the release.