The person may be referring to this product, or one like it. I have seen Mold Remediation companies walking the thin line when they make claims for their service, using unregistered products.
http://biosolutionsproducts.com/products.html
There is a lot of misinformation that arises when products attributes are communicated from person to person to person.
The first person describes the product as a "cleaner", who tells another, and then that person describes it a little differently to another, calling it a "remover", and then on down the line until someone says it is a "Mold Killer".
If anyone who is actually selling the product or service inaccurately describes the product or service as having legal attributes of being a fungicide, and the product or manner in which said product is used as a service, is not EPA registered as such, then that person could be in violation of federal law, if such description inaccurately conveys attributes that may not be legally claimed, per EPA regulations.
On the other hand, in actual fact, it is perfectly legal to "
clean" a surface of mold, as long as proper clearance testing is place to ascertain the effectiveness of the cleaning process. However, if you actually claim that a fungus is "killed" or altered to render harmless, then you are quickly proceeding out of the gray area into pesticide claims.