Alas, i'm about as convinced about this as the pee pee tape, or, more aptly, that Trump was ever a good businessman. His inability to keep his trap shut would have made him a bloody awful agent. Unless, conversely, he's actually talking about Trumps notoriously quick tweeting finger in which case its slightly more believable.
I'd be curious to know what possible use the KGB would have had for a 3rd rate property mogul who couldnt keep a casino above water. Hardly the Philby of his days, surely?