I had a monoclonal antibody infusion (Pemgarda) last week. I got it because I am immune compromised (kidney transplant recipient) and therefore qualified for this emergency authorization medication to prevent Covid. I have not previously seen the case study you cited, or heard about MCA as treatment for long Covid.
My LC journey started about a year ago. Main symptoms are sleep disruption, body aches, abdominal pain, fatigue, headaches, chills, nausea.... Like most people, my diagnosis came after my docs ruled out many other things. By December I was much improved, but then I got Covid again, and all of my LC symptoms returned.
Wouldn't it be great if my Pemgarda infusion cured my LC! I will keep you posted.