This episode of "Skeptics with a K" has a great segment about the infiltration of Academia by such people.
https://www.merseysideskeptics.org.uk/podcasts/skeptics-with-a-k/episode-480
Also it may be this episode where Dr Alice points out that in the UK DEI is mostly referred to as EDI by those in the field.
This suggests to me that one should be extra wary of someone talking about "DEI" in a UK context, if they don't even use the localised acronym.