This really doesn't pass the smell test for being hobby income. C'mon.
The quotes "I got paid just under $2k for some work done" and "it wasn't planned money anyway" can be reasonably interpreted to mean this was a one-time deal and not part of the OP's normal business. If so, it very much is "hobby income." But that interpretation may not be correct, so it's back to the OP for clarification.
Yeah, I'm still going to disagree with you there.
"a hobby is defined as an activity that you engage in 'for sport or recreation, not to make a profit.'"
OP called it "work" and I can't imagine anyone helps lawyers with court cases for "sport or recreation."
I also doubt OP would have done the work for free, and therefore was engaged in the work to make a profit.
Just because it was a one-off job, that doesn't suddenly make it hobby income.