Hi Paul.
🙂 i hate to be like this :). But its really impossible to say from this video. You need to get him in a full flashing position – at least for mé to tell.
I am not sure, I have before been too quick to give an opinion :), but I used to have a male of The Real deissneri and he could look like this. But its not very far from some of The other species such as p. Sentang, p, ‘blue Line’ and maybe others. One of the characteristics which for me would be certain would be how the line in The caudal fin is, is it a broad band or more like drops of white ? And is The tail really pointed with this small spike or does it just look so when its a little folded as it is in the video. It should be there also when he is flashing 🙂
You might have a look at the video which I have posted here in https://www.parosphromenus-project.org/en/forum/15-Scene/1161-Køge-Aquarium-messe-2012–Aquarium-fair-Copenhagen.html
In The middle of this film, although its dark and maybe not so good, but there you can see my male deissneri – maybe it can help some