Why do we see models in SFM animations not on TMR?

[Poyo]

This probably isn't the right place to post this, but I couldn't find a better one.

Take this video, for example.



You see some fantastic models from Hyrule Warriors in them, but looking at the Hyrule Warriors page on TMR, neither of them are there.

How do these animators get these models? I'm not certain about the way SFM works, to be honest.