I think that was a typo on the video producer's part, the 3-valves were in the top 10 in 2005/06. Ford wasn't making 2-valves anymore (for mustangs anyway)
From The Ford Modular Engine wiki entry
The 3-valve SOHC 4.6 L with variable camshaft timing (VCT) first appeared in the redesigned 2005 Ford Mustang.
The engines are equipped with an electronic Charge Motion Control Valve (CMCV) system that provides increased charge motion at low engine speeds for improved emissions and low-rpm torque. Cylinder block material varies between aluminum used in the 2005+ Mustang GT and cast iron used in the 2006+ Ford Explorer and the 2007+ Ford Explorer Sport Trac (see below), though the same aluminum heads are used in all applications.
The 3-valve SOHC 4.6 L engine was on the Ward's 10 Best Engines list for 2005–2008.
Vehicles equipped with the 4.6 L 24-valve SOHC include the following:
- 2005–present Ford Mustang, 4.6 L, 300 hp (224 kW) and 320 ft·lbf (434 N·m)
- 2006–present Ford Explorer, 4.6 L, 292 hp (218 kW) and 300 ft·lbf (407 N·m)
- 2007–present Ford Explorer Sport Trac, 4.6 L, 292 hp (218 kW) and 300 ft·lbf (407 N·m)
- 2009 Ford F-Series, 4.6 L, 292 horsepower (218 kW) and 320 lb·ft (434 N·m)
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http://en.wikipedia.org/wiki/Ford_Modular_engine
Apparently they are still using them in Crown Vic police interceptors for the 2-valves, but the 2005 Explorer was the last prodcution car to use them.