A 2009 isn't threadless? the threaded 9/8 stuff was dropped a long time ago.
A threadless steerers OD is 1.125" that is what they were referring to.

But, threadless stems are not quill stems, not compatible.
threadless grips the outside of the steerer tube 2 bolts on the back.

you may have too short a threadless fork steerer ,
then a 'stem raiser ' is the part you seek, to add height
to accommodate what the hacksaw took away.

then you buy an up angled threadless stem to get the bar height you need.
It grips up on the top of your stem raiser.