Back of the envelope calculations from the abstract: An 8-bit tiny pointer would be sufficient to reference an array of size 2^2^2^3 ≈ 1e77 (≈atoms in the visible universe) with fullness 31/32 ≈ 97%. Or size 65536 and fullness 63/64. For 16-bit tiny pointers, there's no point in going bigger than the universe; fullness goes to 99.98%. Like you, I'd love to see such an example worked out.