It might not say it in the guidelines, however I looked through that site out of curiosity and I personally wouldn’t trust using any of it. All it takes is to use one thing that isn’t supposed to be for commercial use (so shouldn’t be on that site) and then the original creator has a case for a lawsuit (against you NOT Episode) 
Always be super careful and if there is any doubt and you can’t find somewhere that specifically says free for commercial use it’s probably best not to risk it.
The fact it has Barbie and Tom & Jerry stuff e.t.c sets alarm bells off.