Yes it's real! Yes, I course it can play 3DS games.
To answer the rest of your questions, though please message the user 'Valwin'. He has all the details you'll need to set up this hack...
No, it was a 5,000+ year old Mayan prediction based upon their calendar that the world will end on the Summer (Winter if you're in the Northern Hemisphere) Solstice this year.
It's still a pile of crap, though...
The 3DS is a fair bit more powerful than the PSP, so I'd hope it's possible - the Wii (from what I've read) is similar in power to the 3DS and can run an N64 emulator, so I'd hope it's possible...?
Off topic: GBAtemp really needs to add a sarcasm tag. Costello, take note. ;)
I've owned both iPhone and Androids over the years. Both are just as good, other than Apples higher price. I'm currently on Android, Samsung S21 I think, and very happy with it.