I can confirm that. Minor p/l- I was diagnosed with SLE about 15 years ago. The specialist I see told me straight up there was zero covid shot trial data for people like me, and it was recommended that I take a wait and see approach. However, many others with less than honest providers were not told this.
The problem for people with autoimmune disorders is a fairly simple one. Our immune systems are already hyperactive, and introducing anything that stimulates an already overactive immune system can cause a serious, sometimes fatal flare of the disease.
The wait and see has of course turned into a hard no for me, and not just for medical reasons. In a bit of medical irony, the med I've taken everyday for many years that allows me to live a fairly active and normal life despite Lupus, just happens to be Hydroxychloroquine.
I don't know if the HCQ has helped protect me from covid or not, but I've never been vaxxed, and have never worn a mask. I'm basically a model of covid non-compliance, and I've never had the coof.