Firstly - your link gives the figures for England and Wales, not for the UK.
So let's use your figures -
as of 23/11/2021 (the date in your link) the England and Wales death toll was 144,137 (found by taking the UK total for that date and subtracting the figures from Scottish daily statement and a Belfast Telegraph article listing NI's numbers)
So, we've got 144,137 deaths, 17,731 of which didn't have any pre-existing conditions.
Which is just under 13.5%
For ease, let's round it down to 12.5% (also adjusts for the possibility a few had conditions that weren't apparent).
That's one in eight.
By your figures, one in eight people who have died of Covid were perfectly healthy.
So not only is the 'Ach, it only kills the ill and elderly, the ones who're knocking on deaths door' stance incredibly offensive, it's demonstrably not even close to being true.