At this point I'm of the opinion it was likely either leaked intentionally to get their messaging out or Mikey tried and failed to set up a damaging leak.
Their having a signal chat about messaging 2hrs before a strike and it gets "leaked" to the opposition press? Further cements exactly why Trump is bombing the Houthis despite running on antiwar. Either too convenient or a fantastic slip up that's benefiting their arguments in public.
Or Mikey intentionally created a group chat and "accidentally" invites Goldberg who we all know his history at this point. They hope they'll get something juicy out of this group, fail to, and then release what they have with the "classified leak!" As the best attack they have.
The latter is more damaging but pretty par for what we've come to expect from the swamp.
Either way, or even if "the story stands" it's got essentially minimal traction. Dems are just desperate for anything at this point with egg and gas prices dropping.