I haven't seen the show, so in all probability I'd be making a bad guess.
Was the analysis based on the following analogy ?
N.Korea<-->US
Tokdo <--> Hawaii
*nuclear testing<-->nuclear testing
*SDF attempt at Tokdo<-->Pearl Harbor
*preemptive strike on Japan<-->H & N strikes
If I totally misunderstood, then please ignore, but please do not underestimate the power of memory, and the negative power of historical distortion/embelishment.
1 out of 10 A-bomb victims were Korean, either S.Korean or N.Korean in hindsight, the 2nd Prince of the annexed kingdom of Choson
Li U 李窶ケテキ (1912-1945) in Japanese captivity got fried under the bomb in Hiroshima and died the same day. I hope neither N.Korea nor Japan would try to copy the US example of actually using the damned thing.
I hope Japan would just back off from making ridiculous 19th century territorial claims when they know they were in the wrong to take them in the first place. Unless they are looking for trouble, they shouldn't draw first blood. There will be no 2nd chance for Japan this time.
Perhaps, in the rare case that there is reasonable doubt of Japan taking the unwise path, the victimized countries of Imperial Japan should have a right to have military bases in Japan together with the US beforehand just to check Japan's military aggression capability. We all want peace in Asia, so Japan should watch itself with its various military drills that 'might' be construed as 'aggressive' drills which is literally in violation of the S.F. Peace Treaty.
Stay non-aggressive, true to the word, and Japan should do just fine IMHO.
* stands for imaginary events