Yes, obfuscation was always a matter of cost: how much money do you need to break the protection? LLM just decreased that amount by a lot.

(Yes ok, RSA4096 is technically a matter of cost, you just need an infinite amount of money)

The cool thing about cryptographic security is that it's an asymmetric amount of cost for both parties - to encode is cheap, to break is many orders of magnitude harder, unlike obfuscation where the difficulty is approximately symmetrical.