I wouldn't agree with this, Vos is not a liberal in the classic sense but he like many other reformed have it seems more respect for liberals like Barth and Harnack than conservatives like Chafer. Still, you and I view the Bible as inerrant, many on the reformed side equate inerrancy as the same as fundamentalism in all its legalistic glory, brushing aside the actual fundamentals of the faith as outlined by Torrey.
I meant "liberal" in the sense of he would see the Bible as NOT being fully inerrant/infallible, as but as having artially word of God, would have been part of the higher critical thought common if that time!
Multiple sources genesis, various prophets etc, he would hold to history of the OT as pretty valid, but would not see it as a conservative one does!