Username or EmailPassword
""On the other hand, their absence makes me wonder how seriously the author can be taken."
"their" [sic] should be "there"
So get off your soap box and please f##k off.
As was mentioned, his usage of the word "their" is perfectly correct.
You know, having typos doesn't exactly make you look smart; on the other hand, when you correct someone who was actually right, you look really stupid.