Suckmuscle is a classic example of the limits of raw intelligence. He's a smart guy, but we all know how Albert Einstein couldn't tie his own shoe laces and needed a guide dog to find his way home. Suckmuscle is the same way, he understands cell biology and how muscle cells get all that food in them to start growth, but practical matters like tendon stegnth clearly elude him.
Kinda sad, really. 
You are the one who is unable to understand that your argument doesen't even apply in this case.
Stronger tendons do not make you stronger if your muscle mass and neurological ability to recruit muscle fibers does not increase concomitantly.
Tendons do not contract and thus they do not generate force, hence an increase in tendon strength does not make you stronger.
Stronger tendons allows you to lift heavier weights
if your muscles can generate enough force to lift those weights.
I do not know how to make this any simpler for you guys to understand.

SUCKMYMUSCLE