I'm no tech, and have zero basis for a definitive answer. But given how the neck is bolted into the body and wood block, I do not see how tightening that bolt --which is simply fastening the neck to the body's neck-mount block more firmly-- will affect what is going on with the soundboard. There are a bazzillion bolt-on neck guitars out there, and once tightened properly, tightening more does nothing to affect the guitar's ability to vibrate --or resonate-- except for the possibility of stripping wood or threads. So while I "suppose" it's possible with our Taylors, I will think that within a normal range of acceptable torque applied to that bolt and junction, I cannot see it making a difference. Call the mothership?
Edward