You did nothing wrong; I tried to visit the link you posted initially (which is on the sopuli.xyz instance; I am on the meow.social instance) and was instructed that I needed to log in to that instance to access the thread wherein the article was hotlinked out of.
For whatever reason the second time I did so I was able to enter the thread you linked to and could visit the Trekmovie site it linked out to. I don't believe there was remotely any malfeasance on your part, only that on my initial attempt to use the link I couldn't access it.