If you look at one of his tags "ucxsz6jvymzvhtkrahwzc7hq", then you search on Yt search bar, you get taken to this channel:
youtube.com/channel/UCxSz6JVYmzVhtkraHWZC7HQ (which belongs to Liza Koshy)
So instead of using the name "Liza Koshy" he's using the unique channel identifier ucxsz6jvymzvhtkrahwzc7hq. Internally the algo references channels by the unique string identifier, not the user defined channel name.
So in a way he's being sneaky, he wants to use other channel names in his tags to get his channel associated in the algo with other big channels (against TOS), but do it in a way that the typical Ytbuer would not know what he's doing.
Another example with the tag: ucer55381wiqo1w_izgci5dq