The problem, at least according to that article and to pictures and videos of shot down HARMs, isn't really the integration. The problem is that Russian AA systems can defend themselves passively using IR or optical sensors, and are highly mobile. Basically, a pure antiradiation missile would only work if the crew of the air defence system makes a mistake or runs out of missiles.
The other issue is that merely because you did get that radar to turn off, doesn't mean that the launching aircraft is safe. Russia (and Ukraine as well) has a true IADS, so it's very risky to get within position to launch the HARM in the first place, let alone stay in position long enough to actually use your sensor package and give more capability to your missile.
Besides, Ukraine had Soviet antiradiation missiles that are extremely similar to the HARMs and that are integrated into their airframes. They weren't hugely effective.
How is an F-16 going to get close enough to Russian SAMs to be able to fly a conventional SEAD mission anyways? The traditional US way of using them is to jam enemy radars while flying F-16s as a wild weasel. The F-16 itself is not a capable SEAD platform - it needs and entire package with EW aircraft and air superiority fighters to defend them.
Besides, the problem in Ukraine is that Ukraine just can't fly even close to the frontline, and can't fly high. That's not just due to air defences - Ukraine used to be able to do this until Russia started using their extremely long range air to air missiles.
The other issue is that merely because you did get that radar to turn off, doesn't mean that the launching aircraft is safe. Russia (and Ukraine as well) has a true IADS, so it's very risky to get within position to launch the HARM in the first place, let alone stay in position long enough to actually use your sensor package and give more capability to your missile.
Besides, Ukraine had Soviet antiradiation missiles that are extremely similar to the HARMs and that are integrated into their airframes. They weren't hugely effective.
How is an F-16 going to get close enough to Russian SAMs to be able to fly a conventional SEAD mission anyways? The traditional US way of using them is to jam enemy radars while flying F-16s as a wild weasel. The F-16 itself is not a capable SEAD platform - it needs and entire package with EW aircraft and air superiority fighters to defend them.
Besides, the problem in Ukraine is that Ukraine just can't fly even close to the frontline, and can't fly high. That's not just due to air defences - Ukraine used to be able to do this until Russia started using their extremely long range air to air missiles.