Don't take this the wrong way as it's not directed specifically at you.
But I call codswallop on that. Something only doesn't work as the previous update only if "something" was changed, whether it was a Dev finally taking a look in and trying to add the 5 Ki needed to use it, or making sure that the Hate Bonus after a successful use of Ki Shout is checking Concentration instead of Intimidate as well (both of which are "issues" related to the ability, since they don't match the description of effects).
Ergo, something associated with Ki Shout Enhancement ability that uses Concentration was changed, whether directly or indirectly. Otherwise, it would still be working.
Er I'm sorry. As DrawingGuy posted, Slashing to Handwraps and Unarmed works. Vorpal works whilst Unarmed. That was all made possible in 2016 yes. But Vorpal doesn't work whilst using Handwraps since that fix in 2016. I should have made that clear.
But again, it's been a good long while now. And with no sight of it being changed, I'm swapping it out now on my main, as it's simply taking up an Epic Feat for no good reason. It doesn't even give an extra +0.5W or anything like that. And I remember you saying it's beyond your ability to fix back last time I brough that up, so I'm not expecting anything this time either. But no news means it's not on radar, and not on radar means it could be years before it even gets a look in. Nope, no thanks. Swapping it out for... well, anything virtually at this point. But certainly not keeping it.
J1NG
:: edit ::
And I'm concerned that you believe Vorpal Strike to be "Fixed". I remember that you went to look at the Issue/Ticket I submitted in, with details on what is wrong a while back. No updates on that front back then. But to hear/read from your info now that it was fixed in 2016 suggests to me that either the Ticket with the details of its lack of functionality was not read properly, or the ticket lacked sufficient detail, or someone has not bothered to update and tell everything that Vorpal Strike is not supposed to work with Handwraps. And so that is why this Feat has remained untounched.
I wonder what the case was here?