Have you flown 6 approaches in the last 6 months and held in the airplane? Or have you flown 6 approaches and held in the sim? Have you made logbook entry saying this? Either way you are good to go. The tracking requirement is a waste of ink because unless all your flights are radar vectors to ASR or PAR approaches you will track a course. Oddly enough 61.(c)(4) which allows you to combine events flown in an airplane and events performed in a sim does not say how many approaches you must log in the last 6 months. It may just be an oversight on the FAA's part. I would suggest you have a total of six approaches logged either in a sim or real airplane along with the holding from your PC.