This Video seems like a few years old, reposted on youtube.
This guy is Angrezon kaa molvi peen di Siri. There is lots of wrong in his words.
1: He misquoted the fact on Little boy explosion. Yes few grams of the matter was what converted into energy per E=MC2. But actual fissile material used was over 50 kilos.
2: Antimatter is produced in hydron collider but in very small quantities. It is not stable and annihilates quickly. It is discovered from the photons it releases from annihilation process.
3: Dark matter is not antimatter. Lots of other BS he said.
4: Biggest concern of Stephen Hawking for CERN was creation of Black holes and its stability. But it was not to the extent this idiot is yapping on.