And I (and others) have said to run into a PoE enabled patch panel is rare and the exception. Especially if you're talking about a home installation where I doubt anyone has a Telco/wiring closet/data center arrangement in their home which provides 48V DC power nor have I seen any structured cabinets which have a PoE patch panel option. So again, in the home application, the statement patch panels have no electronic parts is valid and I would argue that in a business/enterprise environment the same assumption can be made as per the reasons I've stated, it's rare to see a PoE enabled patch panel.
there is a 120 volt outlet in the wiring closet with APC 1500 UPS that functions just fine, the POE panel comes with a power injector that inputs 120v outputs 48V DC, have 3 installed in my wiring closet, heck I even have a power injector that converts 120V to 12V DC in there. Just did a switch upgrade of 10 standard panels to 10 POE panels for 1/10 the cost of swapping out the businesses Cisco 37XX layer 3 switches.
I disagree with the wiring being terminated in the Dmark panel, that is poor construction and even poorer planning. The Telco here will charge for a service call if anything has been touched on their external box at a residential address which is normally no charge unless they walk into the house.
If the builder assumed what you say, then it is the builders fault for not verifying what was on the build plan and requested by the buyer, if it is written down in the specifications the builder needs to make it right