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Since he clearly asks you for a "quote," I wouldn't assume he's looking for free advice.
Tell him what you'd charge him to answer those questions and see if he hires you.
The client said "I suppose you'll quote me for the above question" which I understand to mean he expects to pay for the answers.
So I'd do just that (propose a price for comprehensive advice)
Edited to add: Will was faster
As a client, I have faced a similar issue. I have posted jobs which required freelancers with specialized expertise to answer questions about how they would work on a possible project. I wanted to be very clear what the work would entail, so I posted the complete question file as an attached file.
Early on I found that some job candidates would start answering the questions! Even though THAT'S THE JOB.
So I found that I had to be VERY clear in the job posting that freelancers applying to the job should NOT answer the questions. (Until they were hired.)
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