There had been a discussion on this forum about the BK Precision vs. Maynuo thing before:
https://www.eevblog.com/forum/testgear/why-is-bk-precision-still-in-business-bk8500-programmable-load-oem-found/If it is true that the lead engineer of the 8500 founded Maynuo then I would not call that "stealing the designs" because it were somewhat his designs, although I agree that the Maynuos are blatant copies. I'm tending to believe that the
post from kmel (from the above mentioned thread) is substantially right because all the listed test gear definitely has a very similar design. We will probably never find out the truth because either side will tell something different.
Anyway, I'm not a lawyer and also don't want to become one and as such I will leave all the stuff about "stealing IP" up to those who (or at least want to) earn their living with it. I'm really more interested about the the technical aspects of the electronic load, especially the specs and the precision.
At about 33:20 in the video, the software reads 1.4 mA before Dave turns on the load and it reads 9.1mA afterwards. At first I thought that's not within spec but after doing the math I realized that it was. In the "low" current settings of 0-3A you have an error in the accuracy of at least 3A*0.025% = 0.75mA but then for the readback of the current you have an additional 3A*0.05% = 1.5mA. So after all you get a spec of 22.5% of error if you want to draw 10mA. That does not sound like a suited device for measuring battery current in the low mA range.