I'm glad you've been able to learn from this exchange. It's been a learning experience for me, too.
I was also expecting a letter from AAA that referenced Rule R-1(d). Rule R-12 also contains similar language: "If the AAA declines to administer a case due to the business’s non-compliance with this notification requirement, the parties may choose to submit their dispute to the appropriate court."
I asked AAA if these rules applied to my case. If they don't, I asked them to explain why. I'll let you know what I find out.
See CCP § 704.070.
"Paid earnings that can be traced into deposit accounts or in the form of cash or its equivalent"
But "earnings" (as defined in CCP § 706.011) means "compensation payable by an employer to an employee".
I don't know if the section would apply to non-employees such as contractors or the ubiquitous "gig" type stuff that has replaced "wages" paid by an employer.