The Infiltrate rule itself says "Units that contain at least one model with this special rule" so I do not see a reason they would not be able to.
It's not the intent, but there's a loophole that prevents it. Same as last edition. You can't actually join the unit to confir infiltrate until after deploying them on the board, preventing you from using it for anything but outflanking.
I am the Hammer. I am the right hand of my Emperor. I am the tip of His spear, I am the gauntlet about His fist. I am the woes of daemonkind. I am the Hammer.