Percussion or percs (as the community call it) are a part of sparta remix. They have 3 (before 2) types or sounds. It composes the kick, the clap or snare, and a hi-hat. Percussion in a sparta remix existed in 2011, but only the basic kick and snare, the hi-hat exists since late 2012.
Fake percussions is simply using other percussions or using FL Studio percs. They were widespread in 2014 but eventually died when 2015 came in.