Yes just tested this as well in Safari same result in the where section not spotlight. testes OW on that machine and this correctly places it in the spotlight comments. Safari used to do this, they changed it.
Anyway with Path Finder my Get Info dialogs never had the URL anywhere. I may flick PF 5.0.2 in CoreServices and see if this does the correct thing.
Edit Path Finder 5.0.2 also shows no URL in the Spotlights comments on files downloaded with OW 5.8
Path Finder has been renamed to Finder.app in /System/Library/CoreServices as far as OW is concerned it should just see the Finder as any old application, unless there is some scripting going on to parse the url to comments.