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.
buying and selling channels is not forbidden currently. Selling and buying channels for the sole purpose of circumventing the YPP review queue is however against the ToS and will be actioned by YouTube.