I am not interested in your mental gymnastics where you deny inconvenient facts such as very image you provided that proves it is L-39.
Another is that for example we know there were Su-7 in service from satellite imagery along old documentary where rear of it was shown.
You without basis are asserting that North Korea has made domestic Su-25 in simplified form as if aircraft itself wasn't simple enough as it is.
If they did we would have known and would have been shown as it was done with domestic production of An-2 along Cessna clones.
1) everyone has their own mental gymnastics, I have mine and you have yours.
2) You identify that it is an L-39, well that's your thought and honestly I'm a little envious of your ability to identify without a shadow of a doubt an L-39 from that very poor quality image;
On the contrary, at the moment I only see a form of aircraft that I cannot identify, which in addition to the hypotheses already listed could for example be this drone
or even a remote-controlled model airplane
3) Furthermore, I never said that North Korea produced the domestic Su-25 in a simplified form, but I wrote something very different and I invite you to go and reread what I wrote on page 81
#808
Request:
Could it be possible that the DPRK has some L-39s?
my answer:
Yes, as he purchased the Mig-21bis, Krivak, Golf, Foxtrot, he may have also come into possession of some L-29 and L-39, but to conclude, at the moment no photo shows L-29 or L-39 with the colors of the DPRK.
PS
However, given my "mental gymnastics", I consider it superfluous to continue discussing.
In my country there is a proverb that says:
"if they are flowers they will bloom",
in the sense that if North Korea is really building some type of military aircraft, we will only have confirmation when they present it or leak some images and only then will we know which model it is.
At the moment, for those of us curious about North Korean things, all that remains is to speculate on some fragments of news