I don't think he's saying he's specifically banned

I don't think he's saying he's specifically banned from using leronlimab but that they are only working with approved drugs for their long hauler effort. Dr. Yo has said similar things in the past. They both still very much believe in leronlimab and the science. Should it be approved, I think it will be added to the toolbox as they recognize that it is safer and more effective than the other CCR5 inhibitors he tweeted.