I've tried it but just can't get it to move enough - and I've nicked the paint on the wheel with my efforts
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But yes I do think that's, in theory, how it is supposed to come off maybe? I just can't get that pin to move backwards enough. Is it possible the pin is attached some other way - like as a clamp around the wheel shaft or something? I notice when I push the pin backwards, it moves more than just the pin - it moves a c-shaped piece of metal attached to the pin that curves around the wheel shaft, but I can't see it very well.
Any ideas for getting that pin to move? If I press on it with a screwdriver, then the screwdriver is in the way and prevents the catch from moving past it... but it's too small and difficult to move with anything else?