I agree that it's sort of a fashy dog whistle, but the concept of cyclic history did not originate with Spengler. This was probably the dominant view of the nature of time and history up until at least the last thousand years, maybe later.
I don't think you should be downvoted for saying what you said, but I feel that you missed the point my comment was trying to make.
My point is: the dog whistle/modern meme is basically a reference to Spengler and others, because their ideologies align relatively well with the patchwork of neo-fascist ideas. That's what they hint to and promote. That's why I explicitly mentioned Spengler and the 20th century. Lot of other people developed some form of a cyclical history but that's not really relevant here.
