Her full tweet (https://twitter.com/math_rachel/status/1441569388289609728) says:

  Medicine, like all of science, is political:
  - which questions get asked
  - which projects get funded
  - how debates get framed
  - who the researchers are
  - context of data (what categories, what labels, which biases, what is left out)
  - whose suffering is counted   1/

Seems obviously correct to me. Certainly research allocation decisions at the level of grant funding are political.