Yes...those are half of the units in the building that have never sold for the reasons mentioned earlier.
It's long been rumored that some investors who build properties like this do it as as a means of "moving money". If they sell 50% of the units (mostly to farang) they are getting the ROI they expected.
The average cost of a studio (42 SQM) in an upscale property like View Talay is somewhere around 3.5 million THB. They are fully aware that some units will sit empty for a long time.