1300 fighters also doesnt include aicraft that are not primarily allotwd for combat. (Even though they could in theory be used for combat) Example would be early f22 batches that now serve for pilot conversion training. or planes for tech and tactics development.
Notably, for f22, the text mentions 134 combat coded f22. Leaving 50 more. Meaning 30 or so for usaf and 20 or so for ang.
Most other aircraft in the article have similar airframes to be added to total tally.
Usaf and ang together have roughly 2000 tactical combat aircraft, when everything is added up.
Equivalent to that would be all the plaaf brigades, frontline ones, training ones, development and test ones as well as training and reserve airframes in various units.