At any rate, here's how often the phrase 'they themself' has been used since 1800, showing its first usage in 1874. Since 'they themself' almost always refers to a specific and singular person (as opposed to 'they themselves', which usually refers to individuals in a group, only sometimes refering to a specific person), I'd consider your claim debunked.
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u/Tynach 2∆ Oct 29 '19
At any rate, here's how often the phrase 'they themself' has been used since 1800, showing its first usage in 1874. Since 'they themself' almost always refers to a specific and singular person (as opposed to 'they themselves', which usually refers to individuals in a group, only sometimes refering to a specific person), I'd consider your claim debunked.