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Could be!
That's just not the impression I got from the way the page in that particular manual was written. It lists the foil towards the end of the procedure, after all the turning, without specifying using foil as you go along.
Putting foil on after defrosting to retain the heat in the warm parts so it can disseminate into the cooler parts is not uncommon. To me, putting foil on during defrosting would be more trouble than it's worth since I've always gotten good results without it. YMMV.
It also seems like a subjective practice that a manufacturer could use to void warranty coverage.
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