“Sola Scriptura” means that everything needed for salvation is contained in the Bible - it doesn’t mean that man is unable to talk about the contents of the Bible, verbally or in writing. No man can add anything of merit to the Scripture - that’s the point.
Why talk/write about it if it's sufficient? Why talk/write about it if it's meaningful only to those who have ears and eyes to hear and see? Why talk/write about it if God decides who hears and who sees and your talk changes nothing, unless its' all for ego and for making God a profitable business venture?