> No but it is like taking Russia's word for how many troops they lost.
Russia mostly just doesn't publish those figures at all last I checked. OSINT researchers however following the Russia/Ukraine war will typically use data from Russian, Ukrainian and independent sources where available however so it also wouldn't be advisable to completely ignore the Russian data either. Even extremely biased/limited data can sometimes be used to identify trends, at least for cases where the bias factor tends to be consistent.
Israel also isn't a dictatorship and has what most would consider to be a relatively free press that is not afraid to criticize the government(i.e. Haaretz) so it would be rather difficult for Israel to deliberately publish outright fabricated data on a large scale without getting caught doing so.
I'm also not saying you should blindly trust any specific sources, however much of the COGAT data can also be corroborated via independent sources such as satellite imagery.
Keep in mind it's also not the case that the UN data meaningfully contradicts the COGAT data either, it's entirely possible for both to be reasonably accurate. In general I would say both COGAT and UN data are both likely reasonably accurate once factoring in the published limitations on that data.
The reason the numbers are different is simply because they are measuring different things. In the case of COGAT they generally measure total aid going through border crossings while the UN measures aid reaching only a subset of distributions points within Gaza.
So if you want to estimate per capita food aid going into Gaza you would want to use the COGAT figures since that data is collected at all border crossings and can be used to get a rough per capita figure on aid entering Gaza. On the other hand if you want to measure something like aid reaching UN system aid distribution points within Gaza then you would want to use the UN data.
Attempting to use UN data to calculate per capita food aid going into Gaza would clearly be wrong as the UN's own published data collection methodology clearly shows they are not measuring total aid entering Gaza.
The UN often seems to publish reports analyzing their own data while clearly failing factor in their own published data limitations into their calculations which results in inaccurate conclusions in their analysis. Usually these sort of analysis mistakes are very obvious as the UN generally publishes the math behind their calculations.
You shouldn't blindly discard data simply because you think the source might be biased in one direction, rather you should try to understand the limitations of the data and corroborate it against secondary sources where possibly while also trying to factor in bias where feasible.
Essentially it's not the raw data where there is disagreement, it's the various interpretations of what the data actually means.
> How is comparing a state that is conducting a genocide to another group that did so too against the Jewish people ?
A war is not the same thing as a genocide. The Jews did not start a war with the Nazi's. Hamas started a war with Israel with openly genocidal goals, Hamas simply did not have the military capability to accomplish their genocidal goals.