What do you think of this explanation for the Grey Aliens?

Update: The you tuber states he not saying it true that theses being are real are visiting us since 1947 he says possible but implausible and he point out the holes in Betty and Barney Hill's story and Bob Lazar those two story need to be proven true in order for people to believe.
Update 2: He a skeptic but he does report UFO seightings he concedes some of the unexplained ones could be alien visitors but unlikly.

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