The plists were hiccuping because they couldn't find the executable, so now that you've deleted them there's nothing for EtreCheck to show...either in red or otherwise.
I've been aware of EtreCheck for probably two years, but I don't know when it first turned up.
It has carved itself a niche, but it's not a tool, i.e. it doesn't do anything; it's merely a window into your Mac and OS. Much of the info it presents is available elsewhere on your Mac and/or isn't generally important, but it is useful for uncovering some situations...as you've just learned.
Last edited by artie505; 12/13/16 01:28 PM. Reason: More