Were already available by 2002… My XT disc brakes I bought in 2001 cost me £100 an end including rotors, roughly what the new equivalent is today online.
And air sprung forks have been around since the very first MTB suspension, the Original Rockshox RS1 was air sprung back in the early 90’s!
Fully aware they where around then, but no where near as many affordable versions,
Look at the bikes out there now with hydro discs and air forks, something in 2002 was on very few bikes under £1.5k