Quite. Indeed, as I've reported before, a few years ago I took out of service (for no reason other than that I had 'found it'!) some early PVC cable (30m or so) that had been buried directly (without any protection) in my garden for at least 40 years, probably a lot more, and was,both visually and by testing still fine when I removed it.
Possibly, but I somewhat doubt it. On the contrary, I would suspect that modern PVC cables are, in general(ignoring and 'rogue' ones) probably 'superior' than those of 50+ years ago - so I continue to suspect that the 'modern' ones will (if not mechanically damaged) remain fine for at least 100 years, perhaps a lot longer (if they are 'allowed' to!).
Maybe there are things which I don't know/understand but, on the face of it, I can't see any good reason why anyone other than those wanting to sell cable would have a reason for even dreaming of advising routine replacement of PVC cable after anything like as little as 25-30 years in service ... but that's just my thinking, and I am not beyond being a little cynical
Kind Regards, John