As you can see on the Shudder official site, A Creepshow Animated Special and A Creepshow Holiday Special have their own movie pages ("movie" is even part of their URLs).

Consequently, they are and should be listed here as movies. You will find them here:

• A Creepshow Animated Special
• A Creepshow Holiday Special

The fact that the word "special" is part of their titles has nothing to do with their classification.

I highly doubt that anyone sees those episodes as Movies including Shudder itself. The fact that the Specials are listed in their movies section doesn't mean those special episode of their TV Show are meant to be movies. If you check their shows you will notice, that not a single one of them has a special episode. It's much more likely that their data structure doesn't allow for a Season 0 or 'Special' season. That is most likely the reason why they list their Special episodes in the Movies section. But time will tell about that.

But it's funny that all of a sudden the data on a shows website matter to you. Because the official air dates of "Late Night with Seth Meyers" don't seem to matter at all. There you are very happy to add a day to their official air-date despite the data on their official website. ;)

I start to suspect that your goal is to introduce as many differences with common sense and other data sources as possible. Doesn't it bother you sometimes that nobody at IMDB or TheTVDB sees it the way you do? ;)