Hello Green Power Ranger, how are you doing dear friend?
Yes, you are correct.
This thread would be better placed in "Other Portable Consoles", "Gemei A330" (as the Dingoo Digital A330 and Gemei A330 are essentially the same console albeit with a rebranding on the outer shell).
As far as it's legitimacy, I am not %100.
Although I have my own theories on that.
Concerning GBA and SNES emulation, you are in luck because these particular unit's stock emu run GBA pretty well on most games and there is the "Hot-PocketSNES" application which runs much, much better than the subpar SNES stock emu.
I have had the "Dingoo Digital A330 EX" iteration for some time (with a Gemei A330 EX on the way) now and I can say from firsthand experience, although it is a far cry from an A320, it is still a very good console for it's current price, even despite it's drawbacks.
Other things it excels at are emulation of CPS1/2, and NeoGeo Arcade roms.
NES, Mega-Drive/Genesis emulation runs well enough despite some reports of sound lag, of which I have not experienced thus far with my use of those emulators.
Other notable mentions are the GB/GBC application "Gnuboy" (a functional emu with space for improvement) and "SMSsdl" (a surprisingly well done piece of work) the SMS/GG emu applications that have been released thus far to help fill in the gaps.
I hope this helps! 3-)