Yep. That's exactly what it means. If the front axle has 600kg on it and the rear has 400kg, the tyres at the front end have more work to do than the ones at the rear when it comes to cornering. During turn in you might still be braking and have 650kg load on the front, 350kg on the rear, and then there'll be less understeer (because the mass at each axle hasn't changed, but the weight has - and excuse the poor non-physics use of these terms!). As you know load sensitivity of rubber means double load doesn't give double friction, so adding mass to an axle can only reduce the ability to move it laterally. Different tyres, different phases or scenarios, different inputs, aerodynamics, can all impact on this. It's a generality. It's only as much of a generality as "weight balance to the front gives more oversteer" which is the opposite of what I'm saying and - I believe - is incorrect. Note the quote I was responding to when I first talked about the misconception.