I think it's because it's not exactly 1 block every 10mins that's why there is no exact date for the next halvening event. Instead it's estimated.
Maybe that's why there are 60 blocks less than you have calculated
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Yeah, that was the only reason I could think of. Hopefully that's all it is. I wonder how it will differ based on distributing according to Hive blocks. Time will tell, I guess.