That might be technically true, but the F35 and F16 are both single engine aircraft and IIRC constitute the bulk of at least the US air force’s combat aircraft.
There are a few single engine aircraft roles (including the F104), but they are not and have never been the bulk of active serving aircraft. It isn’t just ‘technically’ true.
edit: ah but they are "military aircraft", sure. fine.
And not all fighter jets are single engine. For example, the F22, F18, etc.