Would it be accurate to claim that is a lie, or is there some technicality upon which the Watchtower can claim that statement is accurate?
Actually, I don't think it's a lie, at all, dear JWF (peace to you!)... because (1) they CAN'T keep records on all of the anointed, because (2) all of the anointed do not attend the WTBTS Memorial (heck, some aren't even JWs!); and thus, (3) they actually DON'T have a way of knowing.
It's also true that they don't NEED to know... because their reason for claiming TO know previously... "to shut up the kingdom of the heavens before men"... is no longer necessary: most active JWs wouldn't partake if their physical lives depended on it. So as far as that's concerned, the WTBTS's work... is pretty much done. They've convinced enough to pass the plate and cup... and thus life... by... over the decades. A buttload more are doing so, now, so...
Bottom line: there are certain things that even the WTBTS can't lie about. Much like the one they fornicate with... "father of the lie"... and demons. Some things these just can't hide, even by means of their own darkness.
I hope this helps and, again, peace to you!