"He's the real deal," is a common expression to affirm someone's credibility. This expression is often applied to an athlete or someone with great talent or used to confirm some claim or observation about a person.
Over the past 45 years, my wife has loved on and cared for hundreds of children. Many people along the way have noted her gift with and love for children and their love for her.
I've seen it in her as Mom and Nana and in her work in church nurseries, in our ministry overseas, and in her current work at a preschool.
Words need to match action for a person to be the real deal. The opinion of others isn't enough, people need to see it for themselves. In other words, it should be obvious to all.