You could have just googled it instead of accusing him of lying, like I did since I was also curious about those numbers.
https://www.france24.com/en/middle-east/20231012--live-israel-announces-large-scale-strike-on-gaza-un-calls-for-aid-for-palestinians
5:06pm: Israel hits Gaza with 4,000 tonnes of explosives since Saturday, says army
The Israeli army said it has bombarded the Gaza Strip with approximately 6,000 bombs containing a total of 4,000 tonnes of explosives since Saturday when it began striking Hamas targets.
"Approximately 6,000 bombs have been dropped on the Gaza Strip with a total weight of 4,000 tonnes," the army said in a statement Thursday.
Several sources are reporting that exact quote. That doesn't mean it's true, obviously, but he clearly didn't make it up.