I think this sort if thing is become a common "problem".
Because something becomes an iconic meme of a recent popular person or series or whatever, and therefore gets "attached" in social media, it becomes assumed that it originated with whatever the modern source is. I would bet that, "It is known..." has been used in rhetorical speeches and orations since such were first uttered!
Nothing like as new minted and unique as, "It does what it says on the tin..."! Now, how many times have I heard that applied to other than a specific brand of wood preservative - until many have forgotten its origin, it has developed an idiomatic life all of its own. But, one day it will be forgotten, until another utters or uses it and it becomes "theirs" thereafter.