Takahata critique summary by Gainax co-founder Toshio Okada A.K.A The Otaking. Dunno if the full thing is online.
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Apparently Miyazaki took it to heart and reworked the manga story to pass the historical materialism Takahata check (Movie was made while the manga was less than midway through)
Some scetches of the incident by the animation director of The Boy and the Heron, Takeshi Honda
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: