The announcements made by DPRK and ROK on ending the 68 year war is a amazing and surprising news. This is a cause to celebrate, but this has almost nothing to do with Trump whatsoever. Western media has made a big deal about the coming summit between Trump and Kim Jong Un but even this is misleading as the original summit and the pending announcement of the end to the war was put on the table by the DPRK and South Korea who will meet on April 27th. Trump is expected to meet Kim Jing Un following the Korean summit.

If anyone deserves credit for bringing us closer to peace it should be Moon Jae In, the current president of South Korea. The last 2 South Korean conservative administrations have both used the conflict to score cheap political points.

Just a few months ago Trump was calling Kim Jong Un "Rocket Boy" and threatening a war with NK.

I think your opening paragraph describes it best.

President Trump was of course quick to jump on Twitter to congratulate himself, and his supporters are all enthusiastically cheering him on.

But I don't think Trump deserves much credit, if any for this news.
I think the only reason Trump "has secured major political points" is because he happens to be the sitting US president.

Regardless, this is a great day for the Koreas :)