When answering a question, you have not referred the person's business to anyone.
In theory I agree. However I have seen in the past where the person answering the question will fill out a referral sheet and send it to the affiliate just in case the customer applies for the mortgage. In that case I most definitely say the AfBA disclosure is required, if for no other reason there is a "referral" paper trail whether a referral was actually made or not. IOWs as the old saying goes you can't have your cake and eat it to.
RESPA 3500.15, section B 1.i. says the ABD must be "given at the time of referral or Where a lender makes the referral to a borrower, the condition contained in paragraph (b)(1) of this section may be satisfied at the time that the good faith estimate or a statement under Sec. 3500.7(d) is provided;
The section applies to the lender making the referral. IOWs if you are processing the mortgage request and you are referring the applicant to an affiliate for settlement services, such as homeowners insurance, you can send the AfBA disclosure with the GFE. This does not mean if you refer the customer to a mortgage lender that the AfBA disclosure for your referral can be sent with their GFE. If you are not the lender then you must provide the AfBA disclosure at the time the referral is made.