You grabbed the movie. You didn't got the payed version (otherwise you wouldn't complain) and got a reference to pirating. Because .. you pirated the movie.
They uploaded it to be in control on TPB. They explicitly ask for you to go ahead, check it and please support them by buying the movie. If you don't do that, you're pirating the movie with the help of the producers. At least in my world.
(Downloading it right now, net's slow. Will watch it with my wife and invest the USD 8 if it has a couple decent / funny / interesting scenes)
If anything, they uploaded a shareware version of the movie to the pirate bay. Them saying you're pirating it is inaccurate. Instead it should be something like "Hey! I see you torrented our movie! Thanks for watching it; and if you feel like, please download the pay-for version of this movie to support us! (We'll even remove this ask for money from the official!)"
Piracy is, in the lazy short verison, acquiring without permission. Torrenting != Piracy when you have permission. e.g. every World of Warcraft update.
What is a valid situation where putting your video onto a website and then talking directly to the people you're marketing to in your video not giving them permission?
You could not be less correct when you claim that downloading this torrent from the content creators is an act of piracy. This demonstrates a fundamentally perverse view of both the laws and ethics of intellectual property on the part of you and these content creators.
I agree they shouldn't call you a pirate if they've invited you to download their torrent. But some people will be downloading without knowing they're allowed to, so the text is only for those people.
Its just a word meaning "80-90% of the population that know how the internet works". Any connotation to ships has been lost to the ages.