From the same article:-
The development phase had numerous delays and postponements and its economic cost was debated, but the project received renewed interest following a 2008 feasibility study and attacks by North Korea in 2010
Nop ! It was just a plan until the North Koreans provocation somewhere in the year 2008 or 2010, its about the same time we started working on the designs.
Well yeah, AMCA does share some design elements with YF-23 and if rumors are to be believed, YF-23 was a much better aircraft than the F-22. Fingers crossed.