Actually it very explicitly is not. Per there website:

“Is Crime Stoppers part of the police? We are NOT the police.

All local Crime Stoppers programs act as the “intermediary” between the Tipster and the investigative/police agency. They are not-for-profits and mostly registered charities that are operated by volunteers from the community. The programs rely on donations from sponsors, community partners and the public through individual fundraisers, to support their efforts.”

It is not a crime to lie in most circumstances, that includes to the police in some cases. In most jurisdictions you cannot lie about your name and address and while under oath. Everytime else is free game.