False induction proof about filling a $2^n \times 2^n$ region using a 3 tile shape

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I already have a proven claim to prove that a $2^n \times 2^n$ courtyard can be filled with L-shaped tiles with a centre tile available to install a statue (of a wealthy donor "Bill" in this half-true story).

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Now, I am attempting the below problem (taken from free textbook: Mathematics for Computer Science textbook from MIT):

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Where is the theorem wrong? Why doesn't the argument made in the first problem apply to the second one?

  • I found the base case, OK.
  • I was thinking whether the odd shape of the second problem would make building the inductive hypothesis difficult. But I cannot really see why the hypothesis as stated can be argued to be false.
  • Is it the case that for this problem, a stronger hypothesis (which was necessary for solving first problem) is not a valid one?