“find out who funded this”
Through Lebanon, seems like Saudis.
Beirut was long the playground of the Saudi royals, before Dubai rose rose in the desert. Osama bin Laden used to vacation there often, before he became religious.
The Saudis established and maintained deep ties with the Sunni elite in Lebanon (like the family of George Clooney’s wife Amal). Lebanese Sunnis are held in high esteem by the Saudis, as trustworthy, discrete, high skill employees to handle financial matters - even in in London and Paris.
A Saudi Prince was busted there in 2015, using his personal jet to smuggle into Syria a big load of cash and two tons of the amphetamine Captagon, which they use to keep their jihadis hopped up, and willing to do suicide missions.
It is not guaranteed to be Saudi money (they may have introduced some other donors (like Qatar) to their contacts - but it sure smells like a signature Saudi channel.
You are correct on all accounts, I was just reading more of Naharnet;
There should be adequate response against those who funded, assuming they exist.
OTOH; a fair number of Lebanese officials are sympathetic to the Hezbollah side, so that needs to be considered too.
That horrific war has raged since 2011; so that brings one to ask, was this previously looked into? Why now?
Naharnet for a long time has been a useful source and their commenters offer up interesting musings.