I have used a similar method.
I use a sawzall and cut a hole in the sidewall and run it down to the rim on both sides then cut it through the tread. Once at the bead I just use a cold chisel and BFH and cut the rest of the way. those steel bands can eat most blades I have tried. I did around 10 tires that way in about 4 hours. not the most effective means but it works when we dont have access to more efficient means. And yes, this will destroy the rims. Haven't tried an aluminum rim but it works good for steel rims.
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