The "s-curve" typically refers to the idea of seeding the teams such that 1 vs 8, 2 vs 7, 3 vs 6. So that you end up with
.. Geo1 Geo2 Geo3 Geo4
.. #1--->#2--->#3--->#4->|
|<-#8<---#7<---#6<---#5<-|
|->#9...#10...#11...#12
..#16...#15...#14...#13
If you draw a line in order of ranking, you create an "S" shape as in red above. This is what the men's committee uses.
The women's committee uses the phrase "s-curve", but they seem to use it to refer to their ranking of teams from 1 to 64. "The committee will create an s‐curve (i.e., rank of the teams 1 through 64)." To me, that's not what "s-curve" means.
The men's committee, to my understanding, does place the teams roughly according to the 1-64, 2-63, etc format. *Then*, it goes and moves things around for the sake of avoiding conference matchups and certain geography.
In contrast, the women's committee goes to geography first for placing the teams. So, when they get to the #5 team, they don't look to placement with the #4; instead they're looking for putting the #5 (the top 2 seed) closest to home. This is a shift in procedures that they started several years ago.
"The committee will attempt to assign each team to the most geographically compatible regional and first‐/second‐round site, by order of the s‐curve. When multiple teams are a similar distance from a site, the team seeded higher in the s‐curve will be assigned to the closest geographical proximity site."
My understanding, and the way that I read experts like Creme, is that geography is considered first. It is not the sole factor, though, as I noted in my previous post. They do need to balance the brackets, and avoid conference matchups (this year for the first time, 2 teams from the same conference can't be in the same region's top 4, unless >four teams get a top-4 seed).
Unlike the men's bracket, where it's reasonable to assume that the top 1 seed will play the bottom 2 seed, there is no such expectation on the women's side.