Thanks yek never saw that page either
Yes - but there is room for confusion here.
Someone could think that adding a shunt first divides by 2 (at the shunt's start point) and then multiplies by 2 (at the shunt's end point) for a net result of 0.
If you could double a signal in real life by adding shunts, people would be running around shunting everthing imaginable (no need to add sexual innuendoes here) ....