I'd be skeptical of anything reported in the Israeli press, based on something claimed by a TV company run by a prominent Phalangist family. Funny thing, Hezbollah people have this really weird tendency to talk to Israeli and non Shia Lebanese media and say exactly what said media wants them to say. It's almost like they aren't actually talking to real Hezbollah people...
And for anyone wondering, yes, the Lebanese Phalange named themselves and modeled themselves after Franco's Spanish Falange, and are, literally literally, fascists who want to Make Lebanon Christian Again. Which is why they got on so well with Begin and Shamir's Israel. They were responsible- along with another former Israeli PM, Ariel Sharon, and the IDF- for the judicially proven to be genocidal Sabra and Shatila massacre, among many other atrocities. Far from alone in perpetuating atrocities of course, but theirs tended to be the largest and most memorable ones targeting civilians.
Though as with their moral compatriots Al Qaeda in Syria they prefer to be known by a different name now, so as not to offend tender western sensibilities (--> 'Kataeb').