He’s lying because he declared a “winner” in a competition between two phones?
He didn’t rig the results. He didn’t handicap either phone. He explained his method pretty clearly. The video demonstrates something that is objectively true...the Note 8 does a better job of keeping apps open in the background than the 8+ on iOS 11. He even states this and says that he’ll have a “rematch” when a new version of iOS 11 comes out.
He didn’t claim in the video that the Note 8 is definitively faster than the 8+. He simply had the phones do the same set of tasks the exact same way and the Note 8 did them faster, then he declared a winner in
this particular settting. That’s it. If you choose to read more into it than that, then that is on you. And given the fact that he makes money doing YouTube videos (as you stated), it would appear that you and you alone have a problem with him “declaring a winner” when he does this.