You're right, I wasn't there.

But let's compare this (KTF from two days ago)...

https://youtu.be/UqXbjBJM-Yc

...to this (KTF from the Denver 2013 show):

https://youtu.be/8fpl48ouZo0

Five years in general don't mean shit. Jon could still sing pretty well in April '13, although his high notes were no longer as strong in general as they were in '08-'11.

That said, he basically lost his voice for good between the first and second weeks of July 2013 - within a week - and hasn't been able to regain any of it since then, no matter how hard he's tried multiple times and in multiple different ways; he's actually getting worse all the time. Just listen to this:

https://youtu.be/B3w3IF4Kv9I (Always from London, July 5, 2013)

And then this:

https://youtu.be/pc1vf38FrXM (Always from Boston, July 20, 2013)

On the London performance, Jon manages to hit most of the notes quite well and sounds powerful in general. At times, he even sounds pretty close to how he did in '08-'11.

On the Boston performance delivered just two weeks later, all the choruses are sung flat, his vocals are terribly weak, he can't control his volume at all, there's no smoothness or resonance of any kind, and he absolutely runs out of gas during the outro, ending the song by shouting completely out of key + breath.

And no, it's not that you "can't judge a performance if you weren't there". I've heard dozens of old bootlegs from the KTF and TD tours, many of absolutely abysmal quality, and yet I can clearly tell that Jon sounds superb on them. Being able to hear his current vocal poorness is the same thing - just the other way around -, and basically none of these new recordings sound nearly as terrible as most of the old audience-recorded stuff.