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He's right - in fact it's hard to keep up with Jonny on his Parkes (Playhatch!) whatever machine you're on.
I have a frame which is said to date from 1929 and which is steep enough to ride like a modern bike. I rode some TT's on it and got results that were good enough (for me anyway) to think that with a modern frame I could revive my racing career. Wrong! I tried for three seasons to achieve results as good as I'd got on the old frame and I didn't even match them, let alone improve.
I have an early one like @themidge a fixed gear 1938/39 Parkes in Reynolds 531 and it rides not that much differently to my 80s track bike. I have the same gearing on both of them. I think if you were on an 80s/90s road bike you wouldn’t know the difference.