It's not only blatantly false (Van Gogh was a wealthy, family-supported art dealer who studied art extensively before he ever bought his first brush, Leonardo was fully inside the art educational system of his time), but is also solely in the Fascist anti ”degenerate” argument.
This is a Fascist post, Archaeo-Histories (npub1gzc…8jaw).
(See: https://www.re-thinkingthefuture.com/architectural-styles/a2941-the-rejection-of-modern-art-as-a-form-of-fascism/)