This deal solves the problem you're encountering, because it allows game companies to use real voices to generate dialogue. It will sound a hell of a lot better than the 100% AI generated voices you dislike.
And it will protect voice actors' jobs because the deal effectively requires new contracts for each use out of scope of the previous contract (i.e., the "opt out" language), and it encourages game companies to continue to rely on voice actors rather than switch to 100% AI generated.
Without this deal, game devs will just go 100% AI (and the tech will improve dramatically), and within a year or two, game voice actors will have no jobs to contract.
This is especially important in light of the trend toward dynamically generated dialogue in RPGs, etc. Without allowing an AI to train on real voice actors, dynamically generated dialogue will have to be 100% AI generated (no human voice involvement).
Voice acting in all fields is already a diminishing market because of AI generated voices. One of my coworkers had to get a job where I work because his VA jobs basically dried up. This agreement stanches the bleeding by permitting the use of AI trained on VAs (but only allowing use on a per-contract basis). Without that permission, AI would just be trained on open source / freely available voice samples, and there would be no contracts, and VAs would just .... not exist anymore.