Yes, fair point, and it's threads like this that hopefully arrive at more accurate information rather than the myths that are being bandied about.
Likewise, if I had a horse that I thought this might be helpful for, I certainly would be having a conversation about that option with my vet.
I think the bit that you highlighted above pretty much highlights what is known about its effectiveness as I understand it.
"Veterinarians commonly use ACS in athletic horses when corticosteroid use no longer shows beneficial effects, mainly in chronic OA cases. Lameness generally improves after the second administration, with resolution occurring after the third or fourth. The effects of ACS treatment typically last three months to a year in joints that are not responsive to other intra-articular therapies. A considerable amount of data suggests that ACS use has beneficial effects, but the findings of experimental and clinical trials are inconsistent."