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Yes. There were no official 11-42 cassettes at the time I think. But there were 42t expander cogs and things available and those worked without issue.
It's pretty cool, a 10-speed long-cage SRAM MTB mech will (theoretically) do 11-42 at the back and 50/34 at the front if you're into that sort of thing.
frankenbike
I think...that's because there aren't any that officially work with such a large cog. 10 speed SRAM MTB stuff pre-dates 1 x non DH groupsets on MTBs and were designed to work with at least two chainrings.