not exactly.
1) the UY month has NO relation to when you can book. none at all. you can book 11 months prior to travel regardless of UY month (i.e. when your points renew), so long as you will have pts available (banked, borrowed or current) for the dates you are traveling.
many people have that misunderstanding, but throw it out asap.
2) UY month only makes a difference if you have to cancel. if you never cancel, you will likely never have a moment's concern for what month it is that your pts renew.
2a) if you travel in november, december is about the worst UY month you could get. if you have to cancel your plans in september or october, you will already be past the banking window and risk losing those pts.
if you typically travel in november, you'd rather have a UY month prior to november, like sept or oct...