It really irks me when the pricing page for any product has any tier that requires contacting "Sales". If you don't want to include pricing for a tier, exclude it from the pricing list or add a "need something else" or "we also offer enterprise plans" after the table. Maybe just a me thing, because I'm guessing it obviously works based on how often I've come across it.
The reason pricing is not shown for that tier (in most cases, I can't say for sure for Notion) is because it's not a normal tier, it includes the possibilities of negotiated pricing and custom setups. Why does it bother you?