Some of the countries that have officially labeled Russia's brutal invasion as a genocide include [list of geopolitical enemies of Russia]

France can't even fucking recognize the state of Palestine until like a week ago, and now they're authorities in genocide? Fuck them.

As for your points list:

#1 goes mostly from claims by the Ukrainian government. It is true that Russia has extracted children from the warzone and it is true that in some cases these children have been sent to adoptive families in Russia, which I heavily condemn, but it's not a generalized thing and most confirmed extracted children have been returned eventually. The official numbers by the Ukrainian government aren't confirmed by any investigative journalism and the invaded Ukrainian state has obvious motivations to claim abduction of Ukrainian children and violations of human rights. The Russian government makes similar claims of forced de-Russification of ethnic Russians in Donbas to justify its invasion of Ukraine, which I hope you don't take seriously because it's obviously state propaganda.

#2 A statement doesn't make a genocide.

#3 Civilian deaths in the Ukrainian war, by any metric you want to use, are contained compared to any imperialist war carried out by the west. Civilian death ratio in the unlawful and horrifying invasion of Iraq was comparably much higher and it wasn't a genocide in my opinion (probably not in yours either). However horrifying the invasion of Ukraine is, it responds to patterns of war between nations, not of genocide attempts against a population.

#4 Isolated instances of war crimes don't imply a generalized intent to massacre civilians of a given ethnicity. War crimes are horrible and the perpetrators should be brought to justice, but again, the scale you bring of "hundreds" doesn't respond to genocidal goals. Massacres of civilians take place in many wars (see Vietnam, Libya...) and are war crimes, but not every war crime is genocide.

Please, do not dillute the meaning of the word "genocide". It's meant to carry an extremely heavy connotation of attempt of total extermination of an ethnicity and culture, and throwing it around lightly is an injury to people suffering from it.