This + a UU that makes them virtually impervious to early invasion after you get Archery.
The Mayans have the tools to obtain an empire - the downside is that they'll have to build it themselves, as opposed to conquer enemy civs, which is quicker. C-tier on deity, possibly B-tier on a reasonable difficulty level such as King would be my guess.
It really depends on what measure you rate them by imho.
The Maya might be an S-tier Civ in terms of
winning Deity simply due to their UU. As long as you fend off early aggression you win with pretty much any vanilla Civ unless you let the game get past t300.
They will also probably be very strong in Multiplayer, where you don't get to settle as much and the UU and Campus is even more important.
The Maya might be a low tier Civ in terms of fastest possible win times, since those are almost always achieved with 20+ cities. That doesn't matter for a majority of the player base, and it might not even be the case simply because half cost Campus is very impactful. I suspect however they will be one of the worse Civs in this regard. They could be above average or genuinely worse than vanilla. It depends a lot on how much adjacency you will be getting on your campi regularly and how bad the housing and wide penalties will actually play out. As they are on paper currently, they look pretty bad for optimal play.
Norway considered garbage? Maybe in the hands of the AI...
They don't get any bonuses towards any VC besides domination, and then their bonuses are almost completely restricted to naval units. They're a great civ for warfare water maps, but outside of that one specific thing they don't have any tangible bonuses. A strong bonus is one that is always present and relevant for all VC, like Rome's instant monument or Greece's extra Wildcard slot.
It's not that I dislike Norway, and other "weaker" Civs, or that I don't play them, the bad thing design-wise is that those Civs feel completely vanilla outside of very specific niches. I don't see why Norway couldn't have a general bonus towards ocean tiles, or settling coast, or pillaging. Those things also help with other VCs. And you can do them almost every game. Most of my games, enemies do not even have capitals/cities that are on coast, even when they start coastal.. I have often built lots of Longships only to discover that there was no shore, either on Pangea or Contintents, to raid. Norways bonus only kicks in when the map allows it and the starts align, really.
I don't think Norway is bad at what it does, in fact it is
the best Civ at what it does, which is early naval domination. But that is very one-dimensional. The best Civ designs, imho, have been those that aren't highly specific and allow for a high amount of creativity. Civ 5 Maya is the perfect example. But Civ 6 Kupe is also amazing, so many different strategies, a nice balance between maluses and bonuses, and lots of creative freedom.