Is this transistor configuration considered "Push-Pull"?
AFAIK the term push-pull is mostly used with digital circuits, but this circuit does indeed both source and sink current.

The two transistors are driven by the same signal (collector of q15/q17), but with a small fixed offset (created by the unmarked transistor with the two resistors) to limit the coross-over distrortian (when the output switches from sourcing to sinking).