Why untill November? its been said after November just some nocs would become ineligibile
Yes, but here's my thinking. IRCC has proven that they are incapable of making effective long term decisions. They hastily implement half baked ideas, and then the program as a whole suffers. Yeah they said they'll be introducing 16 new NOCs or whatever, that's not relevant to most of us. But outside of this, there have been repeated official comments to modify the system and start implementing Federal (not Provincial) NOC specific draws, along with french draws. With this tweet, they have indicated that they will start to implement some changes starting November.
So it is in your (or anyone pre-ITA's) best interest to assume the worst: that this change will disrupt regular functioning of the draws and things will get chaotic for a few months
at least. So assume the worst, do what you can to get as close to 500 as possible, and plan accordingly. It is simply foolish to give IRCC the benefit of doubt. Only only stand to lose if you assume they will function competently.