If you've been following Schnorr's work, his pathway for the last decade can be summed up as thus:
* 2011, retires from work at RSA foundation
* 2015, publishes first version of this paper, stating, "This is a WIP".
* 2017, 2018, 2019: Publishes updates of this paper, still stating "This is a WIP". Paper mostly ignorred.
* 2021: Publishes this final update. Removes "WIP" marking. Adds sentence (verifiable in original paper), "This destroys RSA cryptosystems".
Whether or not it's true, the level of dismissal here is kinda insane. This guy has credibility up the wazoo. The paper is dense and beyond my understanding. But this guy ain't some crackpot, this isn't some out-of-nowhere change: He's been clear about his intent and goals for nearly a decade, and now he says it's achieved.