Where does the WT say scientists will only be able to make "lifeless" cells? It makes no such distinction. It says that life arising from non-life is a "challenge" for scientists but If they manage it it will be "something truly amazing".
Can you quote where JWs have ever taught there is a "theological" barrier to scientists creating life from non-living matter? That's what you claimed above but I am not aware that they ever taught this, Maybe they did teach this at one stage I don't know. Their recent publication have no problem with the idea. In fact they incorporate it into their argument for an intelligent .creator.