I don't think it's autoimmune, I just know that testosterone and DHT are our bodies natural immunosuppressants, and with PFS we can't use testosterone or DHT properly. This is either due to a dysfunctional androgen receptor or 5ARII enzyme, or both. Or, it could be a different reason.
Unless there's a large amount of people making their PFS better from immunosuppressant meds I don't think it's worth it to think down this line.