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NH has two different 789 configurations —
https://www.ana.co.jp/wws/us/e/asw_c....html?c=b787_9 — 246 seats (C in rows 1-11) and 215 seats (C in rows 1-13). The ANA website is right — your flight is scheduled for a 246-seat configuration where 11A is a "true" window (unlike the 215-seat 789 where there is no 11A but 11C instead).
Thank you for locating that! It all makes sense now. Appreciate your advice too. I'm going to stay in 11A for now, I was worried there might be toilets or a galley behind me but it's just premium economy.