That will probably give better results for all top layer and specially when the slope is low (and it probably only have to be done for top layers ? ).
Unfortunatly it can only work for specials models and with specifics hotends if trying to render the top layers at once.
But maybe it is possible and a lot more easier to implement to do that special rendering on 3/5 layers at a time, it will give great result on low slope top layers while it is IMHO not necessary on high slope layers.
I've been waiting with baited breath for a slicer to incorporate a more usable version of this since the original hackaday article in 2016.
I don't know if the strength is improved like the article surmises, but I do feel there's value in a cnc-style parallel toolpath to cleanup the stair-stepping on a model's contoured top surface (in one direction, anyway).