Never mind what was the CRS min. for the draw that provided you with a NOI. You have to maintain information on your EE profile updated.
You're NOI is still valid, it will only expire after 30 days of emission and for no other reason.
If you have already mailed your application you will for sure get a request for additional documentation as you'll have provided an expired document. Apart from that you don't have any reason to worry. IELTS minimum is an obligation for you as the principal applicant.
Good luck to you two!