Vast majority of those were not destroyed or damaged. I think some of the tabloids may have conflated "any vandalism or attempted vandalism" with "actually damaged", but, well, that's tabloids for you.
So it didn't happen, because it was *obviously* made up? The problem with such reasoning is, it does not require substantiation. You should find 20 people that also believe it(shouldn't have a problem on this platform) and you can start a religion.
I mean, I'm unsure why you're so excited about it. Whether it happened or not feels almost irrelevant to me (it'd be far from the worst behviour by loonies during the pandemic), but there seems to be very little evidence that it actually did happen in significant numbers.
Like, even if it had been 80 masts destroyed, the ongoing impact would be nil; they'd just have been replaced and 80 masts is in any case a trivial number (it's difficult to get numbers on how many exist because the ONS data counts nano cells, but there seem to be over 60,000 'real' masts in the UK, anyway.)
(Also, where're you getting 'over 80'? From a quick search there seem to have been maybe 5 masts damaged/destroyed.)