Yes, they have admitted in print that they are not inspired and not always right;
“… the “faithful and discreet slave” has alerted all of God’s people to the sign of the times indicating the nearness of God’s Kingdom rule. In this regard, however, it must be observed that this “faithful and discreet slave” was never inspired, never perfect.” (Watchtower, March 1, 1979, page 23).
“Jehovah’s Witnesses today … do not claim that this slave class is infallible” (Jehovah’s Witnesses – Proclaimers of God’s Kingdom, 1993, page 626).
That however is not rellevant, because THEY MUST BE TREATED AS IF THEY WERE;
“It is vital that we … respond to the directions of the “slave” as we would to the voice of God.” (Watchtower, June 15, 1957, page 371).
“To hold to the headship of Christ, it is therefore necessary to obey the organization ... Doing what the organization says is to do what he says. Resisting the organization is to resist him.” (Watchtower, May 1, 1959, page 269).
“… a mature Christian … does not advocate or insist on personal opinions or harbor private ideas when it comes to Bible understanding. Rather, he has complete confidence in the truth as it is revealed by ... “the faithful and discreet slave.”” (Watchtower, August 1, 2001, page 14).