Different systems have different methods of doing surprise, but the implication here is you roll to see if you are surprised, and success means you are not surprised.

It’s not a mistranslation that caused it, kobolds were both described and illustrated as doglike until 3rd Edition where with no explanation they simply changed it and decided they were lizard like/draconic.

I do think the new version of kobolds is an interesting creature, but truthfully they should’ve just come up with a new name for this new creature instead of just completely changing the kobold.