It used to be commonplace on forums to have a signature which’d be added below every post and it’d usually be something about youself like how to contact you. Zeb complained about not having this on the forum way back in the beginning. Discourse can add that feature but it’s not on by default.
There’s a possibility that the post was intended merely as a delivery mechanism for a link but the person seems to know the show well, took some time making the post and if I took a guess why a random link was there i’d be that they couldn’t find where to put a signature so they just appended it.
I’m not sure and i’ve been too strict before on new users so I aired with caution.