Amazing pic I must say, wow!
Is it possible she requested that herself as well, considering her career change!??
Well, everything is possible, but, afaik, contracts for these scenes by adult companies are mostly a one-term pay-off thing for the model. The actor/actress signs a contract, gets the money, and after that the company is the sole owner of the copyrights and therefore has the right to decide what happens with it.
But, if something like that should happen (pornstar or family/friends requesting deletion for whatever reason, and the company agrees), then I think it would be logical that all scenes of the performer/model get deleted.
In Dylan's specific case, I just guess that those scenes get deleted because, after her retirement, she is no longer in the spotlights and therefore it's no longer profitable for Brazzers to advertize with her, which eventually will lead to (almost) zero downloads and, in the end, deletion. Of course, it also creates extra space on their data servers for vids and galleries by the new and still active generation(s) of porn stars.
It's still a guess though. But it's possible. Brazzers has been deleting scenes for years, mostly old scenes and/or scenes from retired porn stars.