I don't think that's the case. Here's a screenshot of the exact same scene with the CRT filter enabled:
It's noticeably different from my previous screenshot with the CRT filter turned off. The colors are washed out, there are faint but also inaccurate scanlines (you can't really add scanlines to an image that's the same resolution as the original image, which is what we're looking at here), there's significantly more pixel blur on the X-axis than the Y-axis (multiple pixels in the same scanline blurring together on a "CRT"), etc. This is clearly a CRT filter.
When the CRT filter is turned off, all that's left is some kind of linear filter over the image which isn't doing anything "CRT-ish", it's just blurring equally in every direction with none of the other effects. If anything, I think I'd guess that the linear filter is being applied after the CRT filter, so with CRT mode enabled you're getting both.