Kate has still not been seen in public since December.
I checked the meta data of the "proof of life" Kate Windsor video. The clip was created March 18th at 20:13. (picrel)
The sun sets around 18.00.(picrel)
Now look at the lighting and the sky in the kate clip and you can see it's nowhere near 8PM
so either:
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This is an old video and has been screen grabbed.
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That wasn't Kate Windsor.