Wikimedia will self-host Gitlab. They can use whatever limits they want.
"Core" is the free community edition. The others are not open source/free and require payment.
Core is plenty for most use cases. That table makes it look like it has almost no features, but most items in the list are either advanced or pretty niche.
I'm sure Wikimedia has the dosh to pay for licenses themselves, but it's hard to see how the per/user pricing model would work for any open source project.