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I don't buy it. The word "heart" is literally cognate to "core". This suggests a very old view that the heart is central.

According to Wiktionary in English that didn’t appear until the 14th century (although that is earlier than the article suggests)

meh the OED has this from early old English (albeit in the form of 'heortan') in the mid-tenth century from Bald's Leechbook.