The main point is that WWE isn’t obligated to immediately follow up on Mysterio’s status given the current story, which would give the organization time to work with the WWE legend and work out a way to keep him within the brand.
If Mysterio does sign a contract, then the WWE can just confirm the recent “report” that doctors were able to restore Rey Mysterio’s sight without any major issues.
With so many former WWE alumni jumping ship to rival organization AEW as of late, it could cost an arm and a limb to keep Mysterio, but that’s only fair considering the eye he sacrificed.