I've read the "What is Nitro Athletics Page" and still have no idea.
http://nitroathletics.com.au/the-event/what-is-nitro
Seb Coe appears to be a fan:
https://twitter.com/nitro_aths?ref_src=twsrc%5Etfw
and
https://spikes.iaaf.org/post/nitro-athletics-approved-by-sebastian-coe