I have too much work to do and I definitely don't have time to be procrastinating... so I obviously looked at what he actually said.
Seems like he was making a joke about their tour being the "Errors Tour" as opposed to Swift's "Era's Tour", and saying they make more than a few errors because "we actually play live". That's it?
That doesn't even insinuate she lip syncs. It implies that some elements of her tour aren't played live (so in that sense it goes after any element, which could be taken to include singing and the band), but it's mainly a joke about the fact that they're a "raw, live, rock'n'roll" band that make errors.
So this is all basically for an 'Errors/Eras' gag?