My layman's attempt at understanding and explaining: a conventional rocket burns where the two fuels meet, whereas this one creates an unignited mix and then an

My layman's attempt at understanding and explaining: a conventional rocket burns where the two fuels meet, whereas this one creates an unignited mix and then an ignition wave travels through that mix, apparently that's something that happens at mach 5. They build a circular explosive gas cloud that they replenish before the ignition wave comes through again. The big engineering achievement in this is to master precise high speed injection to the point where they always have a fresh cloud of pre-mixed explosive gas in place right before the explosion wave comes through. I'm certainly no "Combustion and Flame" reader but if this new method is such a big deal and has been theorized since the 1960ies then I guess a burn of pre-mixed gas must be known to be even more violent than combustion at the mixing boundary.