Two things that article said stand out to me. The first is:
"Do not be “quickly shaken from your reason” when faced with what appear to be damaging attacks by apostates or other such deceivers of the mind—however plausible their charges may seem."
Notice that it said, "however plausible their charges may seem". In other words, don't believe it even if it's true because it came from an apostate. I have known that an apostate could say that Trump is the president, but a JW will refute it simply because it came from an apostate.
Also, this point stood out: "Surely there is ample evidence to show that you can trust the channel that Jehovah has used for nearly a hundred years now to lead us in the way of truth."
So, there not counting any time before 1918? I think that's a new thought.