This is a pretty confused piece of writing and totally falls apart on myth 4:

> Only the opinion of the experts in a given field has any bearing on any question in this field.

This has nothing to do with science and is really a point about the division of labor/economics.

The rejection of experts has been a hallmark of scientific and mathematical thinking since ancient times, most famously in Socrates. But the thread continues throughout all of human history.

I like Grothendieck's work a lot, and I know he had unconventional politics. But this reads like one of the many Marx-influenced attempts from that period to discredit the idea of truth.