I understand where you are coming from Susan.
it seems that MGP sells mainly bulbs so they may treat daylilies like they do bulbs and pre-dig and let go dormant. Remember the ones that can be bought in the plastic bags at Walmart or Lowes, they have gone dormant and once planted and revived they will grow (usually).
This could be how they do it. Or they may just get them in from a wholesale supplier and just resale them how they come in. I couldn't find anyplace that says they grow their own stock. On the clump specials it says they are field-run clumps but it doesn't say they are grown in their fields so who knows.