You can and you do. The argument is simple: At steady state testosterone production is balanced by testosterone metabolism. Testosterone metabolism is proportional to free testosterone. Therefore free testosterone is proportional to testosterone production. Therefore unchanging production implies unchanging free testosterone—independent of SHBG. We've been discussing this issue for some years now; you've had ample opportunity to form coherent objections....
If testosterone production remains the same as SHBG is increasing, you can't have the Free T unchanged.