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Huh? CCS1, CCS2 and NACS are DC. You are probably thinking Type 2 (Europe) which is indeed 3 phase and j1772 (US) which is single phase.

Your distinction doesn't matter. They're talking about the plug/socket shape, which is shared between DC and AC standards.

Look up the difference between CCS1 and 2. It's just J1772 vs Type 2. The DC part is the same.