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That's exactly what I'd do.It looked "off the wall", but by golly, it worked just fine including the unclamping feature.
It never would have occurred to me to use a miter saw in that configuration, but he apparently knew from previous use, it would cut a 4 x 4 clean through.
I would not have used a flimsy squeeze clamp, rather screw a support block under it AND a bar clamp to hold the saw.
I don't know how else you're going to get it cut perfectly square with a smooth cross cut surface.
I've never watched a professional do it but I assume they'd probably just do the best they can with a Sawzall.