As someone who has sat on, and even chaired, disciplinary hearings I can say with much certainty that the player would have a much greater chance of getting off a VC charge than an OFFINABUS charge. They would just argue it was said in the heat of the moment, they never had any intention to carry it out, and that there was at never any point any physical contact. Whereas that argument falls foul for OFFINABUS as the acts of actually speaking the words is the offence.
I had it myself years ago when a sent off player, where I had advised the referee to send him off for an off the ball act of VC, said to me as he walked past me and said "you're going in the boot of my car". The other team's manager was next to me asked him what he meant and he repeated it, adding that he'll never been seen again. You don't really get a much more sinister threat of violence than that, but when I asked The FA, via CFA, for guidance they said it can only be OFFINABUS as no physical action actually took place. He was still charged and banned for threatening a match official, whereas there would have been a very good chance of him getting nothing had I reported it as VC.