A few words in the Italian magazine "Il Tempo" is not a study.
I have looked, but I can't find the source. While I would like for it to be accurate, I suspect the "65,000 lupus patients" story is fake news.
Here's a website that might eventually develop the sort of information that is supposedly in the elusive study:
In Italian a commenter of the original story said he had contacted the Italian RA agency and got this as a reply. Reply translated to English.
We are sorry to inform you that the journalist has misrepresented what we have communicated to him and that there is no investigation into patients using hydroxychloroquine in Italy.
The register of the Italian Society of Rheumatology (CONTROL-19) includes 150 patients with rheumatological diseases and of these 20 were taking hydroxychloroquine.
Unfortunately, we are receiving many similar risks, as the publication of the aforementioned article has created much confusion.
Trusting that we have clarified the misunderstanding, we send our best regards,
Luigi Sinigaglia - President of SIR