Faden: Most of our exercise machines are still in use after one year  A recent survey of our customers shows this  Greenwall: But many of those customers could easily be lying because they are too embarrassed to admit that they don' t exercise anymore  Faden: You have no way of showing that customers were lying
Your objection is absurd
Faden presumes, without providing justification, that the evidence for a claim has not been undermined unless that evidence has been proven false.