Ehh... no.
Tinfoil is not a insulator,the characteristic of a insulator is, that they posses a very poor thermal conductivity (λ), tinfoil has the same λ as aluminium, which has pretty much one of the highest values metals can offer.
Combined with the fact that tinfoil only is about 0,010 to 0,015 mm thick, thats the reason why you can touch the foil a few seconds after you have taken it out of the oven.
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