I think it depends. In terms of the overall death toll it’s probably not far off. There is not the same kind of scientific, forensic process that is going on in Israel but as an estimate it’s probably reasonably accurate.
Where you need to treat with a pinch of salt is the death tolls ascribed to specific events, the distinction between civilians vs combatants (combatants out of uniform are counted as civilians) and children (anyone under 19) vs adults which are often very misleading. By design I would add - the classification is not done by accident.
For example, if an 18.5 year old terrorist changes into civilian clothing, attacks an IDF soldier, and is killed, they count in the official death toll as 1 civilian child, which is misleading in terms of that’s not what you’d imagine is meant by civilian or child.
If Israel targets a weapons cache in a residential building containing say 10 terrorists, some under 19, and wearing ordinary clothes, it will be recorded as 10 civilians killed in a home, including children. They are deliberately trying to mislead you and pass young adult combatants off as small civilian children so you do have to be careful. But the overall death toll is probably accurate.