Clearly, the Ford web page author made a mistake. However , OHV = over head valves and you don't have to have push rods to have over head valves. So while the usage is misleading, it is not false. The 4.6L V-8 most definitely has a over head valves. It also has a single overhead camshaft. So while it is an SOHC engine, it is also a OHV engine.
Especially when you measure the horsepower with special intakes and exhaust...
Not true. You might be able to claim that push rod valve trains have more reciprocating mass, but not necessarily the whole engine (and even then you might be on shaky ground). You should check out NASCAR push rod engines (even the Toyota NASCAR V-8). They spin those 6 liter V-8s to over 10,000 rpm with push rods. If valve train reciprocating mass was the main deterring factor in engine performance, race cars would all be running flat head engines.
Does yours?
People get fixated on maximum horsepower numbers. What I want is a car that drives properly. I've had 240 HP cars that were a pain to drive in traffic, and 140 HP cars that were a joy to drive in traffic. The V-6 Camry I test droive a was a POS. If you floored it, it accelerated briskly, but in around town driving it was hopeless. Unresponsive, the transmission constantly hunted for the right gear, and unless you floored it, it lagged like heck. My SO's 4 cylinder automatic transmission RAV4 drove much better in traffic. Toyota can publish all the big numbers they want for horsepower, but if it drives like a POS, it is a POS.
Ed