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“Losing protection” refers to the total overprotection granted by the above article, do not pretend that this grants carte blanche. The rest of international humanitarian law and other laws still apply, including the rest of the geneva convention.
That same article establishes clear limits of proportionality which they did not comply with, and even if they had complied they have violated so many others (have you read the news?). This attack is flagrantly illegal, and is one of the most moderate they have had against hospitals.