Really? That's interesting.
I say it when I don't want the OP to rock up to an interview thinking that T-SQL is just a bunch of 'select' statements rather than a large set of complex built-in functions, flow of control statements, cursors, CTEs, etc.
I don't think it's difficult to learn or use, nor do I find doing T-SQL particularly interesting. It's just a tool to get the job done. Although performance tuning queries can be strangely rewarding.
Given that it is a support job, you wouldn't expect that the applicant would know more than the basics of SQL. If it were a developer role you might expect a bit more knowledge.
Just make sure to spit on the floor if they ask about cursors.