Not knowledgeable on DB but was asked to comment here.
It looks reasonable to me, but I have a few concerns.
Given the current standards, just being opposite concepts of each other is not really enough to consider them as dualities.
Much like how "life and death" was rejected as being a duality (it would have to be "life and non-life" or "death and non-death" for example, just read this whole thread for more info), positive and negative energy wouldn't be one for the same reason, since the Nonduality page has its dualities working off of logical negations instead of classical/cosmic ones.
Is there any statement that implies he would remain after the universe's destruction? Might sound a little pedantic but it looks like Type 1 for Toei is solely based off of this reasoning, so I'd rather have a scan for it that confirms this, since I didn't see any in the blog linked.
And since I'm already here:
Not all Type 1 concepts are Platonic. They can be, but it's not the default. The image of the World of Forms in the page is just an example to illustrate the idea of the ability (as is the case with any other P&A page), but it's also a legacy/remnant of the very old concept standards when Type 1 concept used to be only Platonic and nothing else (nevertheless, it's still a good image to represent the ability even today).