Quoting the article...I think you are wrong indeed.
here is the sience
http://racingcardynamics.com/understeer-and-oversteer/
Which makes the article irrelevant to OP's problem.
And @RoMaN14 is right, moving weight to the rear should (in general) induce understeer not oversteer but the dynamics of it are quite complicated and by cherry picking car type, setup etc. it's possible to prove the opposite as well.
In a simple case it all balances out. For a case of steady cornering, moving CoG forward has an effect of front needing to increase lateral force to balance the torque between front and rear tyres on the center of mass. But at the same time moving CoG forward changes weight distribution so there is more weight to do that extra work. So moving CoG will not have direct effect on balance.Moving CoG forward will induce understeer due to simple laws of inertia, centrifugal forces and all other laws I cannot even spell now. It's been 30 years since I took last physics classes and it was not in English ;-)
For example just introducing "tyre load sensitivity", front coefficient of friction will go down with more weight causing "understeer". Or having different ARB settings front-rear can create "oversteer" tendencies with more weight on the front due to relative changes in spring stiffness. It is really all about the details.