If your premise is that people would shift to using AI to write tests they don't understand, then that's not necessarily a failing of the contributor.
The contributor might not understand the output, but the maintainer would be able to critique a spec file and determine pretty quickly if implementation would be worthwhile.
This would necessitate a need for small tickets, thereby creating small spec files, and easier review by maintainers.
Also, any PR that included a non spec file could be dismissed patently.
It is possible for users of AI to learn from reading specs.
But if agents are doing the entire thing (reading the ticket, generating the PR, submitting the PR)...then the point of people not understanding is moot.