The study this references turned out to be based on bogus data and bad statistics. The original authors since amended their data and don't back down from their conclusions, but they seem a bit unjustified (IMO, and the opinion of their critics).
Here's the tweetstorm (sorry) from the professor that initially called this out [1], the acknowledgement of the errors [2], and the tweetstorm (again, sorry) from that professor again pointing out that the corrected data shows "Covid survivors DO have thingies in their T1. But it is JUST AS COMMON in people with similar risk factors who have NOT had Covid. In other words, yes there are those funny thingies in the scan, but it is NOTHING TO DO WITH HAVING HAD COVID. It is because of the background risk factors" [3].
Here's a news article summing this all up nicely, if you prefer [4].
[1] https://twitter.com/ProfDFrancis/status/1288246926392070145?...
[2] https://jamanetwork.com/journals/jamacardiology/fullarticle/...
[3] https://twitter.com/ProfDFrancis/status/1298524305945436161
[4] https://www.tctmd.com/news/message-unchanged-say-researchers...