Sure same as barred rocks, etc. However from what I've seen and read the ability to sex at hatch has little to do with barring width and is simply because the males ("80%") are lighter and have a head shot while females have the common chipmunk pattern.
I did have four chipmunk patterned chicks die and since I didn't mark them I don't know if any or all were my Crele females, spangled, or something from my assorted batch.
The double barred gene breaks up, and lightens the down pattern in males. Seems to me that duckwing OEGBs have a tendency toward those traits anyway, and it's amplified by the barring. What percentage of Creles are auto-sexable? I haven't hatched enough to know that yet.
I do know that in Cream Legbars you have to select your breeders carefully to maintain the auto-sexing trait. I get chicks that are a little "iffy" and turn out to be pullets, but I've never missed on sexing them. I also know that hatcheries do very little, if any, selective breeding for form or color.
I suspect with Crele OEGB that if you selectively breed, hatch, and look, at enough of them and you'll be able to get darn near 100%.
This will be a fun project. Keep up with what you hatch (anyone with Creles) and let's see what we find out.