Interesting. Still sharp as a tack I see from his other answers (though this was 5 years ago, which is a long time when you're that old), remembering english mustn't even be his first language.
So Fischer was a deathbed convert to d4 after all.
Bobby Fischer: 1.d4 is stronger than 1.e4
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Apr 11, 2021
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"What is better - 1.e4 or 1.d4 ?". And once, Bobby answered to me definitely that 1.d4 is better, because the d4-pawn is defended, while the e4-pawn is not - it perishes quickly. The d4-pawn is more solid.'
Source: http://chess-news.ru/en/node/17235
Boris Spassky 2016 interview.
Your last conversation with Fischer?
"We discussed which move is stronger: e2-e4 or d2-d4? We concluded it was the second, since the pawn is defended by the queen. Bobby phoned himself. I never bothered him by telephone since I knew he’d start again with his talk about his 'Fischer' chess. I didn’t approve of that idea - there are too many variations - but he stuck with it."
Source: https://chess24.com/en/read/news/boris-spassky-i-m-waging-a-war