Yeah this persuaded me more than I thought it would, but there are still some pretty big differences IMO. A frontier AI model is a lot harder and more costly to produce than an encryption algorithm. Especially if we believe Anthropic that the Chinese can only do it by distilling their models (though tbh I would err on the side of not believing that).
Everything is on the shoulders of giants in one way or another
RSA algorithm you can print on a shirt - and that would give you encryption that works as well as it possibly can. There's no "RSA 6.7 Turbo Pro EncryptingPlus" that would give you something radically new that the "t-shirt RSA" can't.
LLMs are massive, complex, and a moving target. Making them is hard, and there's no "we're done" there - the frontier updates every few months. It's easy to get and run a 2B model locally, but what concerns people isn't a cheap end device 2B - it's the 10T RLVR-fried monsters that frontier labs play with nowadays.