The links are safe. Not hosted by Watchtower. Atlantis posts are trustworthy.
If you click on a link that goes back to Watchtower website (I posted one recently), Watchtower would be able to discern that access to their site originated from this site and they would know the IP address of the internet provider that your device came in on, which in turn might or might not give them a general geographic location of the device that was used to access their website.
If that worries you, you can use a VPN to hide your footprint.
I personally don't worry about Watchtower seeing my IP, although when I was first leaving the cult, I was a little paranoid about such things.