Nonsense, sola scriptura means that individual believer's interpretation of the Scripture is the only inerrant way to establish issues of faith and morality. 2 Timothy says nothing about individual interpretation of the Scripture.
There is a good reason for that: first, there was no Bible neatly packaged that people could buy for everyone to read, and second, very few people could read, let alone interpret the Scripture. So, this was clearly not intended for the "general" audience.
One more point: Scripture at the time 2 Tim was written was not canonized. When they talked about the Scripture, the Apostles referred to what we now call the OT or, more correctly, Old Covenant. Given that the Jewish Scripture to this date is not canonized, and that Christian Scripture was at least 300 years from being canonized, and then never became fully and uniformly canonized, there is no such thing as "all Scripture," simply because so many Christians do not even agree what Scripture is.
Here is another: Rev. 22:18-19 : 18 I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them...
St. John is here talking about the book of Revelation specifically.
2 Timothy says nothing about individual interpretation and neither does Sola Scriptura. If you want to invent definitions for the doctrines of other faiths you are free to do so, but you will still be in error.
One more point: Scripture at the time 2 Tim was written was not canonized. When they talked about the Scripture, the Apostles referred to what we now call the OT or, more correctly, Old Covenant.
If you believe that the Apostles were only writing of themselves then you are right. However, if you believe that the NT and the OT are God-breathed, then both are scripture, and every reference to scripture in the NT applies to both the OT and the NT.