One of the purposes of stealth is to preclude getting close enough to an enemy plane for a dogfight to occur. In addition to questionable state of repair, Iranian F-5Es were acquired in 1975 and 1976. Those ~45-year-old airframes have a lot of hours on them.
The Iranians have apparently been hard at work upgrading and refitting their fighter fleet, including the F-14s. While there was a period parts were in short supply, they have either reverse engineered spares and 3-D printed some. Add to that upgrades in armament, avionics refits, and better radars, and these planes are once again formidable air superiority fighters.
They have done the same with the F-5Es and F-4s they have.
So, it would be dangerous to assume these are sitting in some boneyard decaying, instead the Iranians have been hard at work to make them fully capable fighters.