Ryanair Group (172 MAX 8's)

Well, Boeing actually is not calling this 738 version the -200 anymore.

Yes, -200 was the name that was given to this new version when it was launched (a couple of years ago). Now, Boeing has quietly changed it, as explained by Sciing. After all, this is just a dense 738 configuration, characterised by a new door layout.

I think Boeing does not want to fuel the impression that there are too many 737 MAX sub-types, and now prefers to emphasise commonality with 'high capacity 738'.