The 8k number also comes from Hamas, the same people who said that 500 people died in the hospital explosion (and blamed it on Israel). Go see the estimates literally anybody else made. All of these numbers come from Hamas.
You know this is propaganda right? That number never came from Hamas go find them quoting it as fact, I’ll wait.
The number came from an interview with a doctor right after the attack and it was mistranslated on Aljazeera. Other news agencies never fact checked it and ran with the number attributing it to Hamas.