They believed in the primacy of Scripture, but they didn’t embrace Scripture alone.
http://www.cin.org/users/jgallegos/trad.htm
"If we now consider the OBJECT of that FAITH which we Christians HOLD, and using it as a RULE, apply ourselves, as the Apostle teaches to the reading of inspired Scripture. For Christ's enemies, being ignorant of this OBJECT, (what object? The object of scripture) have wandered from the way of truth, and have stumbled on a stone of stumbling, thinking otherwise than they should think" Orat 3,28
"But our faith is right, and starts from the teaching of the Apostles and tradition of the fathers, being confirmed both by the NT and the Old." Epis 60
'Of course, the holy Scriptures, divinely inspired are self-sufficient for the proclamation of the truth. But there are also numerous works composed for this purpose by blessed teachers. The ONE WHO READS THEM will ==UNDERSTAND== the INTERPRETATION of the Scriptures AND will be ABLE to GAIN knowledge he desrires' C. Gentes 1 the only thing he refers to here is writings about scripture to help people understand. It is not talking about something that is not based on scripture.)
Bolding and coloring mine.
I have given you a list of church fathers who emphatically claimed Sola Scriptura as the only authority. To claim anything different is to call them liers.