Now that I've had a chance to see the original video I am curious about the general issue of chips like the EF52AXW shown that apparently have no datasheet. It isn't the first I've seen obviously and it pops up as an issue in similar posts here from time to time.
Are these produced only for some industrial market or only with Chinese language datasheets? If so why not just have Chinese printing on the chip.
With specific regard to the video (which I just skimmed) it seemed that the chip was a much larger package than necessary since only a handful of pins seemed to be used. I'm going to assume the device actually works and did more than just blink the LED.
I suspect that it is done partly/fully on purpose, to minimize the risk, of other suppliers, copying the device (reading its software), and selling it themselves.
E.g. If you use Microchips, PIC MCU, programming service. You can request that they put your own, custom label on it. I'm NOT sure, if they still include the usual PIC chip markings, in that case. But even if they do, other manufacturers may allow that information to be missed off, on purpose.
I don't think it is reasonable to go on a forum. Making your first ever post, getting a reply. Then solely on the basis of that reply, claiming that the entire forum, with what, 100, 1,000 or 10,000 or ?, other users, is completely terrible, therefore they are immediately leaving it.
That does not sound reasonable at all.
EDIT:
I can't even see much/anything rude or bad, about the post, he seems to be complaining about, either.
On a technical forum, such as this. It is quite normal for us to disagree about technical matters. It should be fine to have different opinions, and then discuss them further.
Whereas the OP, seems to be throwing his toys out of the pram, and making a scene, for no good reason at all.