I have a hard time imagining that any nation state that operates its own tanks, wouldn't have a thick dossier about each tank type that a potential adversary mi

I have a hard time imagining that any nation state that operates its own tanks, wouldn't have a thick dossier about each tank type that a potential adversary might field. So these leaks in all likelyhood are not militarially damaging in anyway, but may weaken public perspective of the military (incompetent with keeping 'vital' information safe for instance). I see no particular reason though to openly share these documents from first sources either. Security through obscurity is bad security on its own, but can be an extra layer when combined with other tactics.