Actually I don't find much sense in the rule of uncredited archive footage not counting. As "archive footage" doesn't count as cast credits and has it's own category, it is not cluttering filmographies that much, while actually being useful information. Since many actors grant their permission and/ore receive royalties I believe it should be listed.
Moreover, there are many cases in which people will assume that it was not archive footage, but something filmed specifically for the movie. Case in point:
Bruce Campbell in
Fargo (not the series, in which he later appeared as well, the movie). As fewer people are actually aware of soap opera
"Generations", from which the footage is sourced and also since Campbell appeared countless times in creative cameos in movie by Coen Brothers, most of the people I've met assume that, as in case of
Intolerable Cruelty, it is footage originally filmed for the movie. It got to the point that for a long time his official website listed Fargo in his filmography in order to do something about situation, with explanation. Now the filmography on offical site was abolished in favor of IMDb page being linked instead, so not having that on his filmography will further result in confusement and his name being added over and over again, with or without "(archive footage)". I have a feeling that people who haven't seen
X-Men Origins: Wolverine will be adding
Hugh Jackman to Deadpool 2 just as well,
As in case of "(deleted scene)" attribute only possible for credited roles I believe we've got to a point when restriction stopped being useful and actually becomes an obstacle to listing information about many cases adequately.
Adrian, Champion
Marking these as movie connections is much more useful, in my opinion, if people will use them. If Generations is in movie connections for Fargo with a decent explanation that Bruce Campbell's appearance is actually from this source, people will learn things they otherwise would not know.
Nikolay Yeriomin (Mykola Yeromin), Champion
Strictly speaking, archive footage in broader meaning is any footage not filmed specifically for the project and yet used in the movie, regardless of whether it is edited into the movie directly or shown on TV screen. In order for footage to be recycled it should be accessed somehwere which might be an archive in strict meaning or personal archive as in any collection of media.
Anyhow, it might be logical to have a special sub-attributes for archive footage, but implementing that might take a lot of time, I guess.