This is somewhat correct.
Actually, for those applying to both categoricals and advanced positions your ROL will look a bit like this (considering you rank both type of programs)
1. Univ of xyz- Anes (4 yr)
2. Medical school of abc- Anes (3 yr)
---------------------- Supplemental List 1
---------------------- 1) Univ of there - Transitional
---------------------- 2) Univ of here - Prelim IM
3. PQR School of Med-Anes(4 yr)
4. Univ of 123-Anes (3 yr)
---------------------- Supplemental List 2
---------------------- 1) Univ of here- Prelim IM
---------------------- 2) Univ of there- Transitional
5. Univ of here-prelim IM
6. Univ of there - Transitional
This means that for every advanced program you rank you will create a supplemental list of preliminary programs. That leaves some flexibility for location of the internship year.
Plus when you create the ROL you can mix and match between anesthesia (or whatever specialty you're applying to) and preliminary programs. If for example you would rather match to preliminary only than certain anesthesia programs on the bottom of your list all you need to do is rank that preliminary program higher in your main ROL.
Hope this helps.
Good luck to everyone!