That recording is so silly. Suddenly they started seeing how industrious other religions are with their "preaching Jesus Christ". Even after you dismiss all the WT man-made rules, you would have to be completely obtuse to start seeing the teachings of other mainstream religion as scriptural. They shouldn't have let the elders corner them into the subject of the organized preaching work.
It's like an equation: if a = c and b = c, then a must = b. Applying that to "true worship", they could have picked any number of WT teachings that don't hold up when compared with the Bible. If those things are made evident, then other things start to become manifest simply as statutes of an organizational, not deeds of Godly devotion.