I'm kinda with him on this--the cut-off for equipment is artificial, and I know from the chatter on the CR list, us old-timers (who I think are a large segment of the participants) are really stretching "period correct" to get gearing low enough to go up hills we would have sailed up when we were young and strong. I mean, how many Campy triples did I see in my racing days?---not a single one, ever...
So now you have a lot of bikes kitted out with mtb clusters, modified rear mechs and aftermarket triples--but, hey, at least the brake cables are non-aero and they are using toe straps.
(At least with vintage car racing the motors haven't degraded--they were just never that fast to begin with.)
I kind of like the idea of two periods--pre and post 80-something.