A phrase or neologism which describes obsolete technology-related neologisms
Solution 1:
I might suggest referring to such items as paleologisms. It's listed in Wiktionary (and has been for some years), but not in more traditional dictionaries, suggesting that paleologism is also a neologism.
Paleologism: A phrase that was coined in the past but is now obsolete
Solution 2:
You could say passé
out-of-date: passé ideas
Collins
Or you could say that's so last year! [or some other ancient period]
Wee and Ying at ScienceDirect.com
You could say old hat, but old hat is probably old hat by now.