Probably anything other than the ability to add the charger within 5' of the panel and the panel must have open slots to add the breakers. Basically unless you could do it yourself for $100 in parts it will be deemed non-standard. Just a guess but after dealing with electricians I expect to be close to right.As a prospective buyer myself, would you mind sharing what exactly made your installations “non standard”?
Running 100' of wire is going will be $200-$300 by itself for the wire. Then add conduit and labor.
Here is the thing. If you drive less than 60 miles a day a L2 240v EVSE is not needed. Buy a good 120v 12-15amp EVSE and be done. It is nice to have the 240v but by no means required. You can even use the one that comes with the car.
I hate to say it but I feel the "free" L2 install is more of a marketing ploy than an honest attempt to help the customer. If you see it as that then you may be less disappointed.