This is (understandably) misinterpreting the criteria for the title "the largest island in the largest lake on the largest island in the largest lake on the largest island in the largest lake in the world". First you would make a (rather small) list of all islands-in-lakes-in-islands-in-lakes-in-islands-in-lakes, then sort descending by largest innermost island and taking the first result. The only reason to actually care about the largeness of the other elements in the chain would be to break ties, which definitely won't be necessary. The fully elaborated form is still technically correct, but is mostly used for the amusement of its own absurdity.