If he has that many employees for his YouTube channel he is letting his expenses get out of control. It is as simple as that.

If he fired everyone tomorrow and stopped making videos, he would probably still be making six figures a year just from people watching the existing content.

You see this happen a lot on YouTube where someone starts getting a lot of money in via YouTube AdRevenue and they start trying to operate it like it is a television station and paying for co-hosts and researchers etc. Costs then increase ten to twenty fold. Then once inevitably YouTube change how monetisation works or people get bored with their content and their revenue dips they resort to clickbait, scamming, and other nonsense.

This could all be avoided by just keeping control of their costs.