The WTS acknowledges that confession to men isn't essential but is strongly advisable. They are generally careful not to state this explicity in the publications , presumably as it would undermine discipline in the congregations. Generally they use expressions like "If you are committing a sin , why not seek the help of spiritual shepherds."
This understanding is also implicit in the agreement that if an elder committed a serious sin several years ago , didn't admit it , but shows evidence of Jehovah's blessing , then there is no need to delete him or for him to resign.
To illustrate- my body of elders dealt with a matter a few years ago when a married sister confessed to immoral conduct several years previously while she was courting because she wanted to get it off her chest (hmmm - perhaps an unfortunate choice of words ). The sister had subsequently pioneered & her husband was in good standing. No action was taken & the PO admitted that she would have been best not to have mentioned it at all , as Jehovah had already forgiven her.