Hi Ben,
Jeremy asked me my opinion about this submission, because I have some expertise on DK board sets.
As you may or may not know, DK was "patched" in December of 1981 to fix a couple of things. The majority of boards that were produced have the patched version, and that's the only one that can be used for score submissions, because the unpatched version has a bug that the player can exploit.
To know whether or not you are playing on the patched version, we would need to see one of two things: either the title screen, or the part number on the board set. Unfortunately, your video shows neither.
If the title screen says "Nintendo of America," it means you're running the patched version. But if it says "Nintendo," you're running the unpatched one. You have credits on the machine, so the attract mode can't cycle, therefore we can't see the title screen.
As for the board set, you showed it, but you didn't show the part number (which is understandable, because you'd have to pull it out).
All cocktail cabs use the 4-board stack, but some have the patched version and some don't. The part number will tell you. If it's TKG-2 or TKG-3-6 (or less than 6), it's the unpatched version. If it's TKG-3-7, it'll be the patched version and you're all set.
You showed the serial plate on your cab, but that won't give any conclusive answers, because any board set could be in any cabinet, and the board is what matters.
So unfortunately, I don't know if Jeremy will be able to accept this submission as-is.
Next time, I recommend running off any credits in the machine, or even just power-cycling it after your game, to make sure the title screen is shown. That's the easiest method. If you want to be really ironclad, you can pull the board out to show the part number.
This is of course Jeremy's call, but if you can do 250K once, I am sure you can do it again.
