That's a bit of an oversimplification. Tenerife actually has several separate climates: the south is arid, while the north gets more rainfall and has the typical laurel forests. And in the middle the vegetation depends on the height of the mountains - at up to 3715 m, you won't have a lot anymore of course. Not that this has anything to do with artificial beaches, but the article might make you think that anything green on Tenerife is also artificial...
Moonscape. Yeah. Sure: https://www.youtube.com/watch?v=QtNM5K4gW88
There are a fair quote of humid forests here. Many different ecosystems
That said, what makes interesting Las Teresitas beach is that is yellow sand. Beaches in Tenerife are volcanic, and lava produces a sand that is very clean, but satin black. Sunbathing there is a strange feeling, like being in a giant ashtray. Black sand is also superhot.
Las Teresitas are a man-made beach using the sand that most people identify as a typical beach (made from white coral sand and shells, so people expects yellow). Either angelfishes find more comfortable to mimick and hide in that tone or is the lack of trawlers (destroying an expensive touristic beach mixing the sand with the black bottom is not allowed, obviously).
Usually there aren't a ton of fish around the islands because they're volcanoes: the mountain extends down into the water too, and there's not much of a shelf of shallow water around the islands. It gets deep fast. I wonder if something in dumping the sand also extended the amount of shallow water there.
Amazing islands!
Funny to read this thread shortly after the short hike to Calderon Hondo volcano.
FV also has natural white sand beaches and giant sand dunes in Corralejo, but I also love black sand beaches. In Tenerife i went to one that was as black as charcoal, kids loved rolling in the sand.
So you might say that the parts in the middle at high altitudes (i.e. the interior highlands) have little vegetation?
I hope they get value from their made beach, before the sea removes it or covers it. Weather is getting tricky, and it's common for entire shorelines to be remade by one big storm!