That explosion looked pretty damn real to me, as well as the totality of the event, ie. the approach, the impact, the resulting motion, etc.
I see no signs of CGI at all. If it had been CGI, the fire and explosion would have been the dead giveaway. Even in hollywood movies, CGI generated explosions don't look that real.
These days it appears that many people refuse to believe their own eyes, thinking that EVERYTHING odd and unusual must be fake.