Pass Labs INT-150 with Power Plant Premier

I just upgraded to the Pass Labs INT-150, which recommends against using an active power conditioner. This amp is currently plugged directly to a wall outlet based on this recommendation.

My entire system in the past, including amps have ran through the PS Audio Power Plant Premier with more than satisfying results.

If anyone can help explain the issue recommending against active power conditioners, I would appreciate it. I have no level of expertise on this type of electrical issue.

Thanks