Even if that would be a considered a bug for the games in question, there is no rule about paid games being forbidden from being indexed. It is merely the way they currently handle things. And as far as I remember and as you can read, this delisting was a mere means to appease the payment processors to have talks.
So Itch might just decide to not "fix" that "bug".
The game in this thread already used the obvious maneuver to be visible. The demo version is indexed.
uberpie also has a nonpaid demo version visible... so there is that.