Well...no, they clearly state:

"Since the Proton Meet servers do not have the meeting password and thus cannot derive the MLS keys, Proton cannot decrypt and record any of the audio, video, screen share, or chat messages." per https://proton.me/blog/meet-security-model

So if they then somehow turn around and decrypt this data, that would be against their statements. It's not against the law to say "We don't have any way to decrypt this data due to the nature of E2E encryption". (Not a lawyer...maybe it is idk)