no, you are not entitled to any reasoning behind the appraised value. the appraisal was completed for the lender, no one else. it is their money that is being sought here. perhaps you should hire a local appraiser to have them perform an appraisal on your home and see where it lands
To the OP - I definitely agree! I've read through this thread and have been following it, too (on & off). If you honestly feel it's worth the $69k more, hire a local appraiser (you say the guy who did yours was from approx. 70 miles away, right?) Hire a local appraiser, pay the few hundred dollars (well worth it if you think you're going to get $69k more!) and get another opinion. I would make sure they are familiar with your type of property (Main house with ADU). Granted, this appraisal may not be usable for any future potential buyer, but at least YOU will be able to speak with this appraiser directly, since you are the client.
I also do a number of private appraisals and actually prefer these for that exact reason! When the homeowner/seller is the client and they have questions/concerns (as you obviously do) they can call me directly and ask! I don't always have the answer they are "looking for" but at least they end up understanding WHY that answer is the way it is. Sadly with purchases using financing (generally speaking) this is not the case.
When I have the lender (bank) as a client (no matter WHO pays for the appraisal, at least in FL) THEY are my client. And when you throw an AMC into the mix, it gets even messier (The AMC is the client, I don't have any direct contact with the lender/bank, buyer nor seller - maybe an agent, but definitely am not discussing the appraisal, just confirming information). I have a classic example of this from a few years ago - sort of similar to your case: Subject was Single Fam with ADU. Long story short, the borrower (this was a refi) called me directly (had my # from my business card) and asked why I was NOT giving her value for her ADU (Guest/In Law Qtrs in my market). I had to tell her "Ma'am, I am not allowed to discuss the report. You will have to go back to your lender and have them contact me through the proper channels." For me, personally, this was VERY frustrating as I KNOW I was giving her credit for the ADU, but it was on a separate line in the report.
The moral of that story is, we as appraisers are bound by confidentiality to NOT discuss the report with anyone but our clients, unless given direct permission to do so. Since you are not an intended user nor the client, the appraiser cannot defend himself (one way or another) against your claims unless you file a complaint. I am in NO means saying one way or the other for you to do so, as I have not seen the report, nor know your market. I just wanted to throw it out there what we see (sadly) very often these days. I won't speak for every appraiser, but I think many will agree, it can be frustrating to have the public VEHEMENTLY disagree with our opinions and NOT be able to say a thing about it unless it's "defending" ourselves in front of a board, etc...
Just my $0.02 - I wish you luck in the sale of your house and am interested in the outcome; if you don't mind eventually sharing