I'm down with that. の down with には、「～に賛成だ」「～に乗り気だ」という意味もある。
4:00 so I'm down with it. （透明スマホのNothingが開発したヘッドホンはスクロール時の音が気になるが）まあまあ許せる。
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1:53 I'm down with that. マスクの予算カットで旅行に行けなくなっても、それは納得できる。
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4;11 from what I can see, he holds down the Pacific, so California seems safe. So I’m down with that.ゴジラは太平洋を守ってくれてるみたいだから、カリフォルニアは安全そうだし、俺はそれで全然OKだよ。
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参考リンク
https://bridge-english.blogspot.com/2016/10/come-down-with-cold.html come down with a cold 風邪気味
https://bridge-english.blogspot.com/2022/09/down-with-king.html down with the king ! 王を打倒せよ！
https://bridge-english.blogspot.com/2018/08/the-captain-goes-down-with-ship.html The captain goes down with the ship 船長は船と運命を共にする
https://bridge-english.blogspot.com/2014/12/go-down-well-with.html go down well with
https://bridge-english.blogspot.com/2018/10/cool-with-okay-with.html cool with = okay with