There are hundreds of these holes - only a few have been excavated, while ground penetrating radar shows the other holes also have stone columns.
The current thinking, which is daft imho, is that the rather large site (IDs from radar as you noted, or as Time Team would say, geophys) hasn't been touched yet -- it's probably going to turn out to be a vast neolithic town, like Catal Huyuk has turned out to be. CH was considered a "ritual" or "ceremonial" site when first dug in the late 1950s early 1960s.