Its doctrines are lies and not supported by the bible
Not all of them. Whereas the bible is not very consistent about anything, so it’s difficult to say what it supports, I would say that on balance the WT stand, for example, on the immortal soul, hellfire and the trinity and doctrines that are not lies.
As for their position on lying itself, don’t forget that the bible is not averse to lying. Abraham lied several times saying Sarah was his sister, Jacob lied to Isaac when he impersonated Esau, Joseph had his family lie to Pharaoh about their occupation, God blessed the Egyptian midwives when they lied about Hebrew women giving birth before they arrived… the list is endless - and all done with God’s blessing.
So by lying when it suits them, the WT is practicing a doctrine that is supported by the bible.