He was talking about a closed scale so I'd like to think he wanted to help you out. They usually leave the scale display on when they are closed and it would be faster than going to a cat scale.
Not that I think it is a good idea persay. If you are not local then it's hard to know when it will be closed.
If you know you are not overweight and need to stretch your legs then sure, why not. I would trust thier accuracy more than Cat scales.