I really enjoyed watching that video, to the point where I wished I made it, and after viewing a few times more, I genuinely believe it's professional to a degree because you can't pull off that sinister attitude elsewhere. What I mean by that is it can stand in as genuine marketing (think of The Swarm news stories) and as an amateur production by students, it's just a matter of it catching onto the public and seeing how it goes
if it is official marketing.
And as Dave (Cheese) shows, it's possible that this marketing is establishing the effects of the Ministry of Joy then going backwards to show how Trisha dilapidated alongside, perhaps, Daniel upon meeting Miles and how she ends up becoming an advocate; It's possible this is a genuine marketing story that we as the audience are investigating and interpreting.
From my interpretation, you can give/take a comparison with Nemesis' marketing which implanted an alien that, we believe, was disrupting our society at that time and that we didn't understand. It wasn't just somehow there, it was given a book and a Druid cult with a particular emphasis on its backstory.
That isn't too dissimilar from The Smiler, in which as Miles essentially says 'people have forgotten how to smile; we have become worriers' and essentially concludes that our society doesn't understand how important it is to 'SMILE' then you have the original Sanctuary which acts as a temple just like the Nemesis creature was a temple to the Druids; The Ministry of Joy is genuinely trying to turn society on its head.
That's just my interpretation and understanding of it though, anybody can think otherwise or think nothing at all about it seeing as it is just (plausibly) marketing
p.s. No problems with the cast, felt realistic for me.