Of course, the famous video could be genuine AND fake...
One can easily imagine that we see footage of the actual aircraft and the flash from the explosion, but poorly edited fake black smoke was then added.
Why ? Because it didn't look "impressive" enough
Don't forget the aircraft probably carried on flying for a while before breaking up - this might have taken it out of discernible range... Also, it may explain why no footage of the breakup and downfall...