FWIW I don’t think this statement is making a claim about mathematical Platonism — read in context I think the (relatively anodyne, even obvious) claim is that the professional aspects and applications of mathematics can carry bias. https://twitter.com/maanow/status/1312377160938774528

Indeed every professional mathematician has seen the human aspects of, say, publishing and hiring; and it’s important not to pretend those are objective in the same (perhaps weak) sense, say, a proof is.

Moreover it’s important not to pretend the profession is apolitical—as in the statement’s examples, we’re heavily influenced by policy (and I can think of many more examples besides, for example the use of the TOEFL to exclude international students).

The debate over mathematical Platonism is interesting and fun, but I think we do it a disservice by turning it into a culture war topic, and more importantly we do a disservice to the important issues raised here by ignoring them in favor of the culture war.