The valve on the specific fork in question was not installed by either Specialized or RockShox. Look at the picture. That fork is THRASHED. There's no manufacturer conspiracy going on here.

The Hydra Air has the valve recessed in to the cap at the top of the fork leg. (took 45 seconds on google to find a picture of the fork as stock) This requires a shock pump, which is a small-volume, high-pressure pump, designed specifically to service air/oil shocks (I remember this from the MAG-21 days)
Shock pumps have a narrow, low profile chuck, designed to fit recessed fill valves.

It looks like the bike's prevous owner removed or drilled out the fork cap, and screwed in an external schrader valve fitting so a bicycle tire pump could be used to top off the air pressure.