Just a thought - make that sentence bold or underlined to make it stand out for guys like me who incorrectly presumed it would work completely for the trial period.
The scenery DOES "work completely for the trial period". It's just the Trial period only lasts 5-6 minutes. Per session, of course, not 5-6 minutes in total.
And, when the 5-6 minutes end, the buildings do not just disappear. A RED sign will appear on the screen, saying the Trial has ended. You must have missed that one too...
And of course, the manual that comes with the scenery also explain this, at Page 3, with screenshots of the scenery before and after the Trial period.