So, does it? We're talking lies of some kind of magnitude, such as really lying about your stats, lying about your client's stats, promoting a product using lies, willingly deceiving people, etc.. Not "I jumped 30 inches saturday!" and it was really 28, or lying about when you walked your dog etc.
We're talking just one lie here, not even multiple.. One significant lie indicates their could be further lies, so one lie is enough.
So does that ruin all credibility, even if some information provided by this coach actually is legitimate etc?
Discuss friends!