Yes, correct. At least for the local store that I was in.
I have no idea if each Walmart has their own buyer, or if one buyer selects titles for several stores etc.
Maybe because the Walmart buyer didn't think it was important to stock it.
Around the time the original Battlestar Galactica hit DVD, I was in a local Walmart looking for that set and something else. Too many years have passed and I can't remember the other TV series title, but a employee...