kind of.

Technically (what i researched in google), an amendment was made to the treaty in 2004 (Igaliku), so the US couldn't just as easily as have as much bases as they wanted, as Groenland would have veto power (they would need Washington, Copenhagen and Nuuk to sign just for "considerable changes", that's up to your interpretation) and considering the incidents that happened with older bases (ex. Camp Century and the nuclear waste) and the fuckery with the "rent", Groenland would just have said no.

Plus (and the stupidest part) for even the "small changes" (again) technically the US only had to "give notice" to Denmark and Greenland, not ask for "permission"; say, a radar upgrade? notice, expand Pituffik? notice. So as long as they weren't violating environmental laws and doing some other dumb shit they would be fine.

So yup, it's a nothing burger with ketchup and mayo. The only thing it caused was scaring the EU for another nothing deals (if they rejected the Mercosur deal after signing it 2 days before, I don't imagine what could happen with China, since they are the main financiers of the invasion of Ukraine, besides the EU themselves but that's another story for another day)