Let me answer your question directly. Is Richard III of England considered notable? Absolutely. Is his profile currently included in either the category, sticker, or template of the Notables Project? No. As mentioned below, that is a choice the Profile Manager can make, and at this time, the Profile Manager has chosen not to place the sticker on the profile. WikiTree has a limitation at the moment where the only thing that will trigger a CC7 at the top of a profile is either the Notables Template or the Notables Sticker. As with anything, this could be changed in the future, and as mentioned above, discussions are still underway as to what would be appropriate if it were to be changed. We won't reproduce those discussions here, as they've already got a good head start in the other thread.
So Notable - yes. In the Notables Project? No.