My guess is that Home Depot is supporting NFC, just hasn't rolled it out/enabled it everywhere yet. The terminals that people have reported and that I have seen have EMV slots, so they may be doing a slow, phased rollout to support EMV, but happened to include NFC as well -- just as it has been predicted that retailers would be doing.
This was probably why Apple Pay was introduced now - to take advantage of terminal refresh cycles to convince retailers to add NFC on at the same time.
We have to keep in mind that Apple Pay has only been know about publicly for a little over a month.. Even for Apple's "partners" such as Panera, work remains to be done, and they knew about it before it was announced. Retailers that had no idea about it (presumably Home Depot is included here) might have NFC as a coincidence. Presumably they are congratulating themselves on their good fortune.
It will take some time for retailers to decide that they want to adopt NFC and test, select, order, receive, and install the terminals. That's why I am not concerned when Apple Pay is knocked for "only" supporting "x" number of retailers/retail locations. That number will likely change dramatically (for the better) over the next 12 months as people refresh their terminal hardware, especially as the CVS backlash gets more and more mainstream press exposure. No one -- NO ONE -- wants to be in CVS' position today; especially someone recently stung by a major breach. I'd have to think that Home Depot is the happiest retailer in the world that Apple Pay exists AND that they aren't part of MCX.