And SARS-CoV-2, unfortunately.

?? 99.9% of people recover just fine and surely they still have their T cells

How confident are you in your position? Literally 30 seconds spent searching: https://www.nature.com/articles/s41418-022-00936-x

I've only skimmed it, but doesn't the article you linked indicate that it is only true for severe/ life-threatening cases of COVID-19?

Doesn't matter, it shows that covid can deplete t-cells as claimed up-thread.

extreme cases of covid is not relevant for 99.9% of people so that's sufficiently close enough to say your claim is exaggerated. Sure, colds can kill too, but we don't treat them the same as Ebola.

The claim that a thing happens is not invalidated by it's relative frequency. You don't get to pretend lightning doesn't exist despite the relative rarity of people being hit by it.

It’s probably a waste of breath on this forum at this point, but look it up, and how long it takes even HIV infected individuals to become clinically immunodeficient.