TIL shadows from trees only project down directly under the tree and never project away from the tree itself. My entire life experience has been rendered useless.
Assuming they're talking about this one: https://www.thisiswiltshire.co.uk/news/25299826.swindon-sola...
It's obvious from the scale of it that the fact of how shadows move over the course of a day isn't going to make much difference, even if they go much above the height of the panels, which they don't need to in order to hide them from people at ground level.
Ultimately, everything we build we build for ourselves, and people will generally prefer something that's nice to look at, if slightly inefficient, over the thing that's optimal at the cost of every other parameter.