moxilot
Maybe we could look at this in a different light. Is the end goal here to get the person off of the sidewalk, or are you looking for satisfaction in seeing the person punished for being an idiot?
If you’re only concerned with them getting off of the sidewalk, then I’d say talking to them is going to get that accomplished faster than the multiple calls into parking enforcement (which has proven to do nothing so far). Even if it’s a a simple “Please do not park on the sidewalk. Besides having people in our neighborhood that need to use that walkway, it’s a violation and you (or your guests) can be fined” may work.
If you’re just looking for vengence and want to see that punk get nailed with a fine, then I suppose you can keep calling the parking folks.