If you are referring to that exact quote, you're probably right. If you are denying that Republicans and so-called conservatives have not embraced Keynesian economics in pushing big-government solutions and government spending to justify jobs and substitute for real economic growth, I think you need to look closer. I would name names, but I suspect you would just tell me they were not conservative. As an example, looking forward, there are a number pushing for mega-spending on environmental programs. Kinda hard to talk about "limited government" being a platform of the Republican Party with those loons running around.
Keen observation but they even have a better one. Levin-bots like their master will say the that republican you picked (GWB) was a conservative, “except on that one issue that they (the bot) opposed”
That way they always win. GWB was a conservative that did NON conservative things. Incidently most tax cuts republicans proposed, and passed under GWB were justified by Keynesian economics. That's why democrats could hi-jack the issue so easily.