I agree with you re grammar and spelling, but shouldn't that be "themselves"? (them = plural)
I'd agree with you, although Oxford University Press usage - a barometer for many academics here in the UK - has recently changed to allow 'they'/'them' as gender neutral singulars...
Amazing, and they added "themself" as a nice and popular way to refer to "this person", I guess. Moreso, they were probably not using any capital letters either. Oxford University Press: go and eat earwax!