I don't think so - even as recently as in December 2013 he was able to sing the song while playing the guitar at the same time. His voice is just shot to pieces.

God, that clip above actually makes me think about the IBTFY renditions of late 2013 as pretty good performances! At least back then Jon's tone was still OK (not the fragile whisper of today) and he could sing most of the song without sounding out of breath:

https://youtu.be/B4uWJBUoglI