No. You really don't know what you're talking about.“supported” I guess meaning it cuts almost the whole tube with a blade
Supported means it eliminates the bending moment so it can... shear. That's why it's called... a TUBE SHEAR and not a tube cutter.
Meaningless argle bargle.You won’t be doing any calculating of shear strength with formulas for non-tube shapes of alloys you don’t know no matter how many times you post it.
A person with reasonable intelligence can calculate the shear strength of mild steel. Of any shape. Because... mild steel can and will shear.