Any advice on how to address this appraisal issue would be greatly appreciated!

They're clearly not having to take any renter calls or deal with any issues. 

Maintenance and repairs typically range from 5-7% of rental income, compared to the standard 10%, as new builds have fewer immediate issues.

I always got the impression that he had a bad criminal record or never got his high school diploma/ GED equivalent or some other issue was preventing him from getting a license, because he was basically just brokering without a license but calling it consulting (I don't know any of that to be true for the record, that was just the impression that I got from his comments and might explain why he used a fake name?). 

As Caleb mentioned, a newer home is likely not going to have any potential issues in the beginning. 

I don't like mixing the two - it can get messy if he stops mowing due to mechanical or health issues, etc.

That is a data/privacy issue that could cost them millions.

Agree, Ring or some other camera monitoring  system, security systems will  have issues with alarms &  beeping and other issues which might be a nuisance for guests. 

I plan to put two duplexes on the property but with this high appraisal is there a smarter thing to do to pull that money out of it or just use it for better collateral for the construction loan most banks will lend on the transfer price within a seasoning period. we face the same issues for land entitlement and development.

Like "renting to section 8 tenants is actually really easy", "your agent is not on your team just connect with people like me doing hundreds of deals every day and use my team instead", that hood properties will have "15-25% net caps" for beginner out of state investors when in reality they will definitely lose money every month due to the rent not being enough $ to maintain a rental property, never mind all the tenant issues involved with this property class or the difficulty of managing them remotely... but he's done thousands of them just this week while sitting on the beach in Florida...