I'd might as well step in to give my say on this matter:
I'm actually in favor of the tag override since this would allow those artists (like myself) making fanarts of existing copyrights to have an easier time getting their reference material, especially if it's high resolution. To take the existing issue with Parsley as an example, the artist's done full-body character designs across GFL and KC and with those not available here due to the artist tag (which, unfortunately, brings the "banned artist" tag with it), we've had to seek other sources that would generally turn up lower-resolution versions of said chara designs.
While I understand that DB has nominal and theoretical obligation to abide to an artist if he/she doesn't want their works here, works done under an official commission/request/agreement would might as well be granted exemption also for the sake of other artists who make fanart.
It might also be stemming from a dissatisfaction with the whole ban system per se, to which I've sent an email to the site admin expressing such, among others. But I must digress, this paradox of official art and the status of one who made it being "banned"/hidden on the site to avoid legal issues is one many of us as fanartists have to confront.