  The interior of a pure-state black hole is known to be reconstructed from the
Petz map by collecting a sufficiently large amount of the emitted Hawking
radiation. This was established based on the Euclidean replica wormhole, which
comes from an ensemble averaging over gravitational theories. On the other
hand, this means that the Page curve and the interior reconstruction are both
ensemble averages; thus, there is a possibility of large errors. In the
previous study [Bousso, Miyaji (2023)], it was shown that the entropy of the
Hawking radiation has fluctuation of order $e^{-S_{\mathbf{BH}}}$, thus is
typical in the ensemble. In the present article, we show that the fluctuations
of the relative entropy difference in the encoding map and the entanglement
fidelity of the Petz map are both suppressed by $e^{-S_{\mathbf{BH}}}$ compared
to the signals, establishing the typicality in the ensemble. In addition, we
also compute the entanglement loss of the encoding map.
