https://www.thelancet.com/journals/langlo/article/PIIS2214-1...
The 11,069 number is from [1], or [2] is from a more neutral source:
> Gaza's health ministry has removed 1,852 people from its official list of war fatalities since October, after finding that some had died of natural causes or were alive but had been imprisoned. [...] Almost all of the names removed (97%) had initially been submitted through an online form which allows families to record the deaths of loved ones where the body is missing.
[1] https://www.washingtoninstitute.org/sites/default/files/pdf/...
[2] https://news.sky.com/story/thousands-of-names-removed-from-o...
One thing is for absolute certain though, the population of Gaza has not gone up.