Do Power Plants have inlet filters?

Hello everyone!

I am curious about one aspect of PS Audio power regenerators. I saw the internals of one of them (old P3) by myself and there is a high quality picture of P12 internals. In both of these models seems to be used some kind of filtering power inlet. Is it true?

I heard that power inlets may make the SQ worse, but my Power Plant sounds amazing, so these things might be a good way to further improve SQ of an audio system.