I'm not going to waste my time going through a spreadsheet to address your misunderstanding of the balanced rig concept. Thick wetsuits aren't a good idea from a buoyancy management perspective, as I already explained above. If you're going to wear a thick wetsuit on deep dives then you can maybe sort of compensate for that bad decision by carrying extra ditchable weight (at least for recreational dives), but it's obviously not an optimal solution. Instead of creating unnecessary problems for yourself just avoid the problem by wearing a proper shell drysuit. This is very simple and doesn't require any clever spreadsheet formulas.Did you go through the attachment he provided? It provides the basis for how someone (who may choose to use a thick wetsuit) might arrive at the optimal amount of ditchable lead.
I don't think anyone has advocated for carrying more lead than necessary - just so it can be ditched. The question is rather, what portion of the diver's ballast ( primarily lead) can/should be ditchable and this obviously pertains primarily to recreational - no deco profiles.