9 mm refers to the axle diameter where it sits in the dropout, and it's the most common one. Doesn't have any impact on q/r size.

Q/r sizes are only listed in length. Front and rear. Sometimes embellished with rear MTB (135 mm OLD) or rear road(130 mm OLD). There are a few extra long ones for bike trailer attachments, and some extra bulky ones for trainer use, but that's about it.

A bigger concern for you is that the bike you've linked to has a 700C AKA 28" AKA 622 mm ETRTO wheel size, but the fork you've linked to seems to be intended for the 26" AKA 559 mm ETRTO wheel size.

You probably should have been looking for a 29er fork.

Normally, replacing a 63 mm travel fork with a 100 mm travel fork may not be such a hot idea. But if you're trying to fit a 26" fork in a 29" frame maybe the changes will kinda cancel each other out.