Not very well explained by the article. Always take Eurasian Times with plenty of salt.
There are several version of the patriot missiles:
MIM-104A
MIM-104B (Pac-1)
MIM-104C/D/E (Pac-2)
MIM-104F (Pac-3) (there are actually several MIM-104F versions)
Up to Pac-2 where all proximity fussed with a significant warhead (close to 100Kg) and the missiles are quite big, each launcher can carry only 4 of them.
With Pac-3 the improvement in electronics allowed significantly improved precision, so they switched to Hit-to-Kill Technology. The warhead is less than 10 Kg, a kill can only be achieved by actually hit the target (actually I think the warhead is not explosive, the kill is achieved by kinetic energy). A smaller and lighter warhead allowed a smaller missile. Pac-3 launchers carry 16 or 12 missiles depending on version.
As far as I know Ukraine received both Pac-3 and Pack-2 systems, so it's actually unknown which one killed the planes.