There's nothing in the data (I use d2 checklist for things) to say there will be more weekly seasonal challenges. So, that means the number is wrong, or something else is coming. Bungie did announce riven wish style update coming at the end of revenant (see 2024 developer update)... so I'd assume that if the number is right then we'll get a load of challenges from that (bento box stuff, I would assume). I don't know anything for a fact... all just speculation, so treat it with a pinch of salt! It might even be a typo in the devs notes... heresy would make more sense as the end of year activity (as rivens wishes were)