Hmm... is he really comparing? It is just that "...a band making a record together in a room" that he talks about. I just don't know how Swift, Sheeran and Mayer work and maybe they are not who he refers to when speaking of "young". On the other hand, when you are nearly 75 everyone is young (apart from Bob).
LE
It implies that "kids these days" only sit in their bedrooms and record everything with computers, not record with a proper band, whereas in reality "kids these days", as Louis Armstrong sang, "Will learn much more than I'll ever know". You can't believe the level of raw musicianship and virtuosity a random 10-year-old bassist or 10-year-old guitar player can achieve thanks to online education. And technology, if anything, made it even easier to jam together, book rehearsal spaces and exchange demos.
So yeah, I'm not sure what he meant here, and electronic youth-oriented music existed throughout all his life, not only these days. Mark recorded some things in his bedroom too, he also recorded a lot of stuff remotely by just exchanging emails, and his latest albums use so much technology it's unbelievable, so... That's why I'm confused. So you can record a song quickly with guys who recorded music professionally for 50+ years? Who knew... Now tell us how much $$$$ this band costs...