I mentioned full time C. Towns, Jackson Jr, Mobley and Horford CAN play center but DON'T USUALLY do so (Gobert, Adams, Allen and Robert Williams do). So I don't see them as straight up, fair comparison for Poeltl. Anthony Davis and Sabonis are somewhere in between, but could be considered true centers.
Sengun isn't a natural center either, but could be included. the Only omission would be Carter Jr. and Claxton, which would be below Poeltl but with potential to surpass him. Landale was included because he outplayed Ayton more than anything, but it wasn't supposed to include every center in the league, mainly starting caliber centers of some relevance. Point remains, Poeltl is an ABOVE AVERAGE starting center right now.