From the macro level, I’d agree about the playbook. At the micro level you couldn’t be more wrong.
Losing their test facility is even more reason to believe this is a play. Saying you are suspending tests when in reality you can't test isn't a concession.
I feel like he is trying to turn a loss into a gain by "ending" his testing and getting something in return. It has kind of already worked, he is getting a ton of positive attention for a murderer. I don't see how he would even give up his nukes, which he believes are the key to continuing the Kim Dynasty, for anything.
I am expecting them to continue the charm offensive by parading Kim Yo Jong out. Wouldn't be a shock to me if she made a Stateside trip for "diplomacy."