It's all about what you mean by "reskin". It is dependent on WOW Classic TBC Gold what you are referring to by "reskin".

Archimonde's Felsteel Anihilator is the one mythic mount I can recall being "original in the time". The Sylvanas mythic mount is also a brand new type.

Recolours are often swap of texture. I'm not certain what the definition actually means. It's much simpler than other tasks to change the color of a picture, since they only have to alter the color by using a slider, and then call it completed.

This is why it's so disconcerting to see so many armors being changed. It is possible to put an intern in that position and they'd be perfectly fine. Recolors should be accessible to buy WOW TBC Classic Gold all slider players.