Should this really be tagged as strike witches? They're mecha musumes with no pants, but other than that, they don't seem to be related to the franchise at all. It's tagged at original work on pixiv...

You're right--it doesn't seem to have any connection other than metal legwear. Replacing "strike_witches" with "original".

No, It shouldn't. Apparently some people think that anything that's either mecha musume or by Shimada Fumikane is automatically Strike Witches stuff.