Yeah, fairly sure it was a mix-up with the site's list of traps. Even in the solutions the site featured for some of the levels where the claw is right on the path, no action is taken to get past it so it would suggest it is harmless.
As I recall, in the Lemmings 2 game engine, any terrain piece can be used in the level either as real terrain, or as decorative element that physically acts like air. (Note: don't remember whether the claw is decorative that way or not. For reference, Shadow tribe features quite a number of this kind of decorative elements.) In almost all cases though, the game is very consistent in its official levels, and doesn't use a piece that has been used as real terrain everywhere for decoration instead even for a single level, and vice versa. Whoever did the styles for NeoLemmix though probably just ported everything as terrain, which would especially make sense if it was done programmatically to rip the terrain from the Lemmings 2 game itself.
