It does not. You even quoted the relevant part.
in such a way that the ban is not readily apparent to the user
The games disappeared from browse for everyone. If the affected accounts could have still seen their own games in browse & search, that would have been a shadow ban.
The qualifier shadow has no information value, if a game gets "banned" for everyone in search & browse.
Your things are newish, except the one thing that is indexed. Read here https://itch.io/t/4120453/game-quarantined-search-or-indexing-problem-read-this Items not being listed for weeks and months is not a new thing. And due to recent events, I would expect a certain additional waiting time