I know that. That still misses the point. The point of the law is to clarify that on digital storefronts that you make purchases for licensed digital goods, that you can’t imply to the consumer that they actually own those goods. It doesn’t matter if there is an offline installer. It doesn’t matter if you can ‘keep your installers forever’.
Yes, if they offload all of the compute for anti-cheat to the customer’s hardware, then you are right for current operating systems.
Client side anti-cheat is not the only way but it is the cheapest way for the game industry.