For the uninitiated, please note that Dr. Clark's definition of fundamentalism is far different than what most other people would recognize as fundamentalism.
I think we could be a bit more charitable to Dr. Clark. Even though Machen was opposed to the anti-intellectual movement within fundamentalist circles, he would have been classified by some at the time of the modernist controversy as a fundamentalist. Call him a fundamentalist with a small f. The OPC still publishes a book called
The Fundamentalist Modernist Controversy. Even Rev. Winzer was willing to be identified as a fundamentalist in a certain sense of the term.
I think Dr. Clark's general observation of the OPC is not inaccurate. You've got much more of a generational connection to the founding of the OPC with some leaders in the OPC whose fathers or grandfathers helped found the OPC. I knew of at least one OPC that was still serving grape juice during the Lord's Supper because some of its members were part of the temperance movement.
I seriously doubt Dr. Clark intended to call the OPC more fundamentalist simply because it rains on a "Kine parade". If anything, that would hardly make much sense as Dr. Kline himself was an OPC minister and Westminster was started as the OPC seminary.