It’s because the cap is interactions, not posts. It’s counting the 25 scans that TSM is doing in the background against the cap. Part of the reasoning for the cap is to limit or eliminate AH instabilities that are primarily driven by addons doing things like scanning over and over to list and relist auctions.
With that said, they’re open to adjustments and it sounds to me like they’re leaning towards most likely lifting the cap rather than lowering it.
The current tuning values are a starting point for this. We very much welcome feedback on AH activities are hitting the throttle. If the current settings are too strict, we’ll want to relax these measures.