>>42490990
You're looking for the channel IDs, that json just has a bunch of other metadata. Here's the same first list stripped of everything other than the IDs: https://u.pone.rs/dlktxjlk.txt
The old format of "https://www.youtube.com/channel/[CHANNEL_ID]" still works, so for example to get to get to the second channel on that list, you'd take "UC-9EwITgSClSE5S69O1MlyA" and do:
https://www.youtube.com/channel/UC-9EwITgSClSE5S69O1MlyA