AFAIK Plenel sources for Rainbow Warrior were french intelligence.

He got completely sidelined on the "Irlandais de Vincennes" story (which in a way is proof he's not a foreign intelligence puppet, otherwise he wouldn't have fell for it, would he?).

Anyways, Plenel aside, I'd happy if you could point out any Mediapart story that you think has been sourced or set up by foreign intelligence agencies?

I've frequently heard Mediapart is biased in a way or another (recently accused of bias by Melenchon supporters, before by LREM, Les Republicains, Front National, etc...) but absolutely never read anywhere that they are a puppet from a foreign intelligence agency.

In a nutshell, please substantiate your baseless claim.