Yeah, right. I mean, I'm so happy that only one of my clients is using GitHub as their GitForge. Every single other one hosts their own GitForge. And I can't state how much better every single other GitForge is.
GitHub was the pinnacle of GitForge a couple of years back, and it seems like they wanted to hit a wall.
Otherwise, you cannot explain how you can enshittify a software that much.
It's a nontrivial calculation valid for a class of forces (e.g. QCD) and apparently a serious simplification to a specific calculation that hadn't been completed before. But for what it's worth, I spent a good part of my physics career working in nucleon structure and have not run across the term "single minus amplitudes" in my memory. That doesn't necessarily mean much as there's a very broad space work like this takes place in and some of it gets extremely arcane and technical.
One way I gauge the significance of a theory paper are the measured quantities and physical processes it would contribute to. I see none discussed here which should tell you how deep into math it is. I personally would not have stopped to read it on my arxiv catch-up