It probably doesn't matter much in this case because the deal does not include new transfers or remasters. They're just going to be reissuing stuff that has fallen out of print. They're handling distribution.
Disney will keep anything they think will be a huge seller for themselves to release.
These are probably reissues of things Disney doesn't think will sell enough for them to bother with on their own. But in this era where streaming services are scrubbing even their commissioned original...