This doesn't seem like a joke, it seems like a guy outright spreading misinformation. Not sure what was the point of the UUID preamble, his "joke" has nothing to say about UUIDs.
And his link to the Google collision was not an accidental collision, like the rest of his ramblings were discussing.
I worry that some people might take away from this that UUID collisions are actually something to worry about (nonsensical kindergarten cubby analogies and so on).
Really, truly, UUIDs can be assumed unique. We’re not relying on luck.