A research group looked at results for over 97,000,000 people, and found
COVID-19 was associated with a 49% increased risk of new-onset autoimmune-related diseases
and flat out:
SARS-CoV-2 infection increases the risk of autoimmune diseases, particularly those affecting vascular and connective tissue. Risk is amplified by severe infection and attenuated by vaccination
and it's hard to imagine a stronger proof - most countries don't have 97 million people in them!
https://pubmed.ncbi.nlm.nih.gov/41452424/
(via AJ Leonardi quoting Hannah Davis)