I tend to agree with this. His voice is so strong in the video posted, and was likewise as strong at the three concerts I saw in the weeks that followed.
I mean, I've seen him cry, or nearly cry, singing "Last Night I Dreamt...." and "Please Please Please..." in the past.
The man is 55, and stage lighting does no one any favors.
I'm not saying anything regarding his overall health - anything seems possible at this point - but I wouldn't read too deeply into this, or similar clips. Don't forget on other songs he was his old self, both at the LA show (as posted) and others.