Someone else just pointed that out to me too. I didn't know of all the connotations of the term, sorry about that. :-)
Avant-garde is a perfect description of Guix. It is an experimental OS that pushes the boundaries of the status quo.
What negative connotations do you think this has among hackers?
I probably will one day, but not right now.
But: I'm not sure you're doing your work any justice by labelling it "avant-garde". I think you risk looking "weird" or more dangerous than you need to and might detract people from looking into it.