Eh, it's still just wild guesses.
All we really know is that someone(s) dug holes in a pattern, and possibly stored some maize and other materials in those holes.
It's even possible that the storage purpose was way after the holes were created. What if at first they were made to slow down the enemy, then both people fighting in the area left, someone else came, saw some cool holes in a pattern and was like "awesome, we got this shitton of corn and reeds and whatnot, these holes will be perfect to store them in!", and bam, now scientists are correlating the two because of the evidence being somewhat blurred.
A lot of archaeology is coming up with wild ideas supported by often very limited facts, and looking at other relevant sources that may or may not support the theory. This is especially true for sites that have little to no written confirmation of the purpose.