That is not part of the Terms of Service that I see. Which makes sense since every country has its own laws and needs a custom terms page. But I talked to youtube and what I wrote in my first reply is the current enforcement strategy of the youtube policy team.
And without being a lawyer, the quoted part of the ToS (at least in my opinion) don't prohibit the selling of channels. But rather for examples ISPs to charge extra to access youtube. YouTube Channel != Access to the service.
And just FYI, this happens a lot with bigger channels. Just some examples: Fact., Smosh, Phillip DeFranco, Roosterteeth and many more.