I guess because you haven't heard about it it doesn't exist. What do you think is driving the right wing resurgence across Europe over the past decade?
https://foreignpolicy.com/2023/11/01/the-far-right-is-winning-europes-immigration-debate/
And even if you've never heard your wide circle of international friends complain about immigration, it doesn't mean the point of the image is invalid. It should be World Law ^TM^ that anyone coming from a former colony of a country should have instant citizenship in said country.
Someone could snip out a joke and claim it was Carlin. Then the disclaimers are meaningless. This happens on the internet all the time.
Writing a comedy set (ai or not) and then having a Carlin bot read it out and then releasing it under his name is definitely crossing some major lines. I'm not sure what the legality of it is at this point, but if it is legal it shouldn't be.