Changing your password from a weak one to a strong one or from a strong one to a new strong one, is good.
It is bad if your changed password is a weak one, so that change means very little.
Don't care about BPIP. You are Bitcointalk member, not BPIP member and BPIP can die / abandon anytime but I am quite sure that Bitcointalk will not die.
For proof of your account, you can do as follows