As additional information, the Soviets definitely had shrapnel rounds from as early as WW2, e.g. the VSh-534, so they definitely have some experience in that particular field of ammuntion.
Specific info for the VSh-534 can be found here (near the bottom of the page)
https://ww2data.blogspot.com/2015/11...152mm-and.html
It's described as a ball shrapnel round although again, there is nothing specifically stating direct or indirect fire usage. However the projectile itself (Sh-501) is capable of using two different fuzes and maybe that facilitates use as either direct or indirect fire but I'm just guessing.