Is the Grendel a “PPU” case?

[MaineAR]

Looking at a Remington 783 to convert to a custom Grendel and see PTG has a “PPU” bolt head available here: https://pacifictoolandgauge.com/1476-rem...ad-ppc_cal

I was wondering if this would work since in my limited search, I haven’t confirmed that the Grendel is a PPU case. Thanks for any help.