Generally that is true. However, more and more growers/seed producers are stratifying seed above ground -and they do not add water. Therefore, the seed is incredibly dry compared to our expectations of traditional wisdom in the literature. On a seperate note, you will be hard pressed to find any grinning seed if it has been stratified above ground. However, this method produces consistently good results with low disease issues and high viability.
When they pull seed out of stratification which is stored above ground, they typically soak it over night before sirring it well and removing floaters.