In the video he clearly talks about the JA version, saying so multiple times.
Why are you saying Viggen is abandoned? It has had constant updates, additions and fixes on every single update of DCS since it has been released. Here for example is the latest update for DCS (a week ago):
DCS: AJS-37 Viggen by Heatblur Simulations
Fixed issue where nav-fixes would be made after switching out of Maverick-sighting.
Multiple fixes to FLI and ADI gyroscopes, amongst other fixing drift simulation and (mis-)alignment.
Increased the strength of the Landing/Taxi light.
Fixed weapon selector RR mode erroneously overriding take-off symbology.
Fixed flares empty (FACKL SL) indication not resetting after re-arm.
Fixed Brä 24% (FUEL 24%) not causing a master caution warning.
Corrected RB-75 guidance for aircraft targets.
The update before that:
Fixed canopy position sync in multiplayer.
Updated RB75 A/B/T (AGM-65 A/B) flight model and seeker behaviour.
Fix to crash when dropping High-drag bombs.
The update before that:
Added Night Vision Goggles
The one before that (nov 4):
Fix to HUD shutting of in sidewinder fast select mode
Added invisible FARP object. Single parking spot.
Added Caucasus short-field training.
Fix to CTD related to saved-games folder in non-latin script.
You can scroll through the change log here: Changelog (digitalcombatsimulator.com) and see that updates and fixes has been constant since 2017.