71.5mm is low for a track bike but don't worry about it, it'll be fine. Lots of people ride fixed with lower bbs than that. You may strike a pedal once or twice but it's something that everyone just learns to deal with and to avoid, much like toe overlap. I must have pedal struck with my road conversion once, maybe twice, over 20 000ish km of riding.

This is intended to be a fixed gear road bike, though you could ride it on the track if you wanted. Honestly, whether it's a "track" or "road" bike is not something you should really stress about. It looks quite nice and isnt that what it's supposed to be all about?