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From what I remember of the video and reading that article I see no contradictions, maybe things aren't mentioned but that doesn't mean it is a contradiction.
The video says nothing about separating the flow. My post said "my reading of strakes is essentially, it separates the single diffuser into multiple diffusers" which you could argue is not mentioned, and you could argue is not technically correct.
The part you are quoting says "If you add an additional fence or strake (a vortex generator of any design really) in each side of the floor it is possible to roll up two more vortices" The video definitely agrees with that.
The vortices help to "seal" the gap between the diffuser and the road. The last image shows a vortex at the edge of the L and one inside the diffuser, the video just mentions the vortex at the edge of the L.
Do you have timestamps or quotes that show the contradiction?
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