If I seem cynical about the explanation that these older files will be restored, it is because Sean Cody has been doing this for years. I think we can excuse the original owner from deleting videos he appeared in (I think he was embarrassed and/or in a relationship when he sold it), but older videos have been deleted before.
I remember that there were two "classic" Dean videos: his initial solo and a follow-up where he was being photographed on a stool while j/o-ing. Only the solo was on the site as of two or three years ago - the other one was deleted.
There could also be a mundane reason. Models in these videos have to sign release forms indicating how long the video can be posted. It is possible that some videos had some limitation on them, like 15-20 years, that required reaching out to models again for permission and the new owners just can't find everyone. It could also be the case that the older videos were lost when a systems issue hit them or need to be restored by a computer expert which can be costly (and MindGeek, the new owner, doesn't really care about quality so they probably just figured no one would notice). Who knows? Just saying that I noticed older videos kind of "vanishing" for a while but the original owner at least gave an explanation for intentional deletions while MindGeek has been silent.
Anyway, back to the purposes of this site, that Dean solo for your viewing pleasure.