No, it is not. This is precisely why we have the term E2EE. An escrow agent having your keys but pinky promising not to touch them is indistinguishable from the escrow agent simply having your plaintext.
Unless you’re fine with the escrow agent and anybody they’re willing to share the keys with being a member of your group chat, in which case my original point still stands.
Unless you’re fine with the escrow agent and anybody they’re willing to share the keys with being a member of your group chat, in which case my original point still stands.