This sort of driving, while it might help you hit an apex, it’s not going to be ideal for front tire wear or controlling the inside rear wheel lift. It’s also going to hurt your exit speed as you have to scrub speed off constantly to keep the kart from driving off the track on the exit.
I think Lee is describing what essentially boils down to the basics of driving fast, but maybe in a slightly different way. Of course the ideal line for a given corner is the one that allows you to carry as much speed as possible while covering the shortest distance, which would mean you are driving right over the apex of the corner. When you take a corner at the proper speed and line, the kart is doing to naturally swing out to the edge of the track.
The technique you’re describing Lee would get you halfway around the corner properly. That is, the entry would be quick and the apex might be correct. If I’m understanding it correctly at least. Bit hard to describe all this over the internet.
There are definitely corners out there where using some out-of-the-box techniques can help you get through the corner without lifting. The one that springs to mind is the tree line corner at Shawano. Top left corner of the photo, 90 degree corner that runs along the trees:
In most karts, this corner is alllllllllmost flat-out. However, if you really chuck your body into the kart and start turning in a little early, you can get through there without lifting.
1:28 in this video: https://www.youtube.com/watch?v=yECrf12TMqo&t=59s
So maybe in a very fast corner this is applicable, but you wouldn’t be braking in a corner like that anyway.