I guess people have different nuanced understanding of what Sola scriptura means. For me, it means two things. First, it is the final authority on doctrine. Anything presented by man that contradicts scripture, should be cast aside.
That said however, we should not limit God to the scriptures in communicating with man and making Himself known. The Bible itself tells us that God can and does speak through dreams, visions, and even nature, and if those who may never have read scripture or heard the word of God preached or taught, live and love according to their conscience, having compassion on others and in their hearts leaning towards godliness, there is all eternity remaining for them to learn theology and the whys and wherefores of how they came to be in the kingdom. Yes, scripture has the final say over all ecclesiastical councils, Popes, pastors and even televangelists. But let us not limit a God who wants all men saved and who is doing all He can to bring all men to repentance... He is not a God who is deliberately making it as difficult as possible to be saved by using fine print and meticulous forms and ceremonies that one must adhere to.
There have been literally millions throughout history who have had no access to scripture. Do we condemn them to eternal damnation because they were born in the wrong place and the wrong time? Or do we believe God is just, and exercises compassion and mercy through doing good and reaching out to lost souls, using missionaries with Bibles when available, but whatever other means He has at His disposal otherwise.