Might this mean that some who think they are doing theology, aren't? - not really doing it unless it's true Scripture-mining that is led and enabled by God's Spirit.

An ideal aim - though all of us are finite and broken to some degree, and living in a fallen world. Still, we can know nothing truly about God unless God's Self reveals it to us, through Scripture and also, in a more limited way, in and through the Creation-rich paths of life, and of our every day.