IMO that's a pretty good working description.
Well, tradition states that you have to get the Catholic church to sign off on that thought before it can be accepted as a legitimate description. Pay no attention to that Bible 'source of information', WE will tell you what to believe.
As long as sufficiency as rule of faith is understood as being not simply formally sufficient, so that one may read such a text as Acts 10:36-43 and be born again, but materially sufficiency, providing, sanctioning even the use of reason and the Holy Spirit by which we understand Scripture, and the teaching office, etc. And i would add, Scripture alone is the wholly inspired objective body of Truth on earth, this assured Word of God alone is the supreme standard for obedience and testing and establishing Truth claims.
Also, "All that one must believe to be a Christian is found in Scripture and in no other source," means uniquely in its completeness.