I see quite a large pitch change there. The aircraft starts more or less level, then pulls up. While inverted it begins to move substantially nose down. As for heading, at the beginning of the video it's pointed well to the left, and at the end of the maneuver the fuselage is lined up with the camera.
Wikipedia is confused or imprecise. Either that "positive g force" refers to the force on the aircraft relative to the Earth, or it's just wrong. Reading through the original reference that statement comes from, I believe it's the former. The book says:
"...we have managed to substantially increase the angle of attack, to a point where the inverted wing is capable of maintaining altitude."
If you're maintaining altitude while inverted, you're not pulling positive gees relative to the airplane, but you are pulling positive gees relative to the Earth.
You can browse most of the chapter on aileron rolls in the book in question on Amazon:
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