LOL, I think your circular saw estimate may have been correct. I fave a Festool 75 track saw with an, IIRC, 8" blade that cuts to 75mm, and or about 3". You should be able to cut 3, 3/4" sheets at once with a 7.25" blade IF it has the power.
It's likely max thought cuts are 4 and 3 and sheets, respectively, but that presumes as Leon notes, one has a circular saw with sufficient power to actually do a full three-sheet cut.
If that's the case, it's a 25% decrease in number of passes which again presuming the case of 50 sheet pile (and the whole pile needs cutting) would be about 13 versus 17 passes.
Hardly seems worth the effort, but he's a strapping fella' so handling the saw doesn't seem that much of a problem; one can move the cut sheets out from under it between passes so don't have to set it back down on the ground every time.
Compared to trying to reach the middle of the top of the stack with a handsaw for those first few cuts, doesn't seem too bad a deal to me -- it's big and heavy enough kickback is a pretty minimal risk and while I don't think I'd have ever thunk of trying it (but I'm surely not stout enough to get the saw up there in the first place now and not sure ever was) but I don't see it as particularly dangerous.
Unusual, yes.
I certainly would want it to run off the end and fall on me, still running.
I don't see it as being much different than any other clickbait.
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