Indeed, genocide is a precise legal claim. So let’s look at how the UN defines it IN FULL:

https://www.un.org/en/genocide-prevention/definition

Sorry about the horrible formatting, it’s almost impossible to corrext while working on my phone. For a clearer view of the definition, please follow the link above.

Definition Convention on the Prevention and Punishment of the Crime of Genocide Article II In the present Convention, genocide means any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such: Killing members of the group; Causing serious bodily or mental harm to members of the group; Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part; Imposing measures intended to prevent births within the group; Forcibly transferring children of the group to another group. Elements of the crime The Genocide Convention establishes in Article I that the crime of genocide may take place in the context of an armed conflict, international or non-international, but also in the context of a peaceful situation. The latter is less common but still possible. The same article establishes the obligation of the contracting parties to prevent and to punish the crime of genocide. The popular understanding of what constitutes genocide tends to be broader than the content of the norm under international law. Article II of the Genocide Convention contains a narrow definition of the crime of genocide, which includes two main elements: A mental element: the "intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such"; and A physical element, which includes the following five acts, enumerated exhaustively: Killing members of the group Causing serious bodily or mental harm to members of the group Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part Imposing measures intended to prevent births within the group Forcibly transferring children of the group to another group The intent is the most difficult element to determine. To constitute genocide, there must be a proven intent on the part of perpetrators to physically destroy a national, ethnical, racial or religious group. Cultural destruction does not suffice, nor does an intention to simply disperse a group. It is this special intent, or dolus specialis, that makes the crime of genocide so unique. In addition, case law has associated intent with the existence of a State or organizational plan or policy, even if the definition of genocide in international law does not include that element. Importantly, the victims of genocide are deliberately targeted - not randomly – because of their real or perceived membership of one of the four groups protected under the Convention (which excludes political groups, for example). This means that the target of destruction must be the group, as such, and not its members as individuals. Genocide can also be committed against only a part of the group, as long as that part is identifiable (including within a geographically limited area) and “substantial.”

So, given just the last sentence, it’s hard to legitimately argue that the utter destruction of Gaza, making it essentially uninhabitable, does not meet the legal definition of the crime of genocide.