I've noticed from the soundboard recordings that the songs sound very slow. Even the new ones.
From the little I know about music, I think the instruments have not been toned down more than the habitual so it has to be Jon (or my ears)
He seems to be phrasing (?) very deliberately, skipping entire words instead of the weird pronunciation he did in the past when he was mashing words and sounds together. This seems to make his singing slower but still in sync with the instruments and it's probably helping his breathing also.
Or I'm just hallucinating