What he means is that Israel owns the banks that control the reserve banks in all countries in the rest of the world. For Israel to fall, it would require the central banks to print their currencies into oblivion, until there is no wealth to extract to fund Israel's defence. 
nostr:nevent1qqsrd76f5dypvtnu3g5mppkdjke0tc2x8pdykvf94lq6q05j7t25e0spr4mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmp0qgst3pg6qm0a082glse9yd9pt6dydge2pxp2sga4fn0cy52tnvfqhggrqsqqqqqpkdld92 

 Hopefully he didn't mean the Samson Option: if Israel goes down it's taking the whole world down with it in a nuclear holocaust...

https://en.m.wikipedia.org/wiki/Samson_Option