To understand most of these jokes, one would need to be pretty knowledgeable in the field of philosophy, and ALSO have a sense of humor. Good luck finding a large population of such folks.
Most would understand some of them and you could look others up to find clues. One you start, it’s like a game or a puzzle.
I particularly enjoyed the Ayn Rand one. Perfect parody. Also Thomas Malthus. I missed a lot, but a friend provided this to explain a few of them.
Parmenides is about change being impossible and existence
being eternal. Pythagoras, which is a weak joke because it has nothing
to do with philosophy, is about the story that he was not only a
vegetarian but eschewed beans too. Thales said that water is the first
principle. Leibniz and Newton both claimed to have discovered calculus
Kant kept diaries where he noted the exact time to the minute that he spent doing various things.