From the same article:

>Independent analysis of satellite imagery suggested that the school and the Sayyid al-Shuhada military complex had been struck near-simultaneously by air-delivered munitions.[39]

The objectionable part of double/triple tap strike is that you're killing rescuers or aid workers. Otherwise from a morality perspective there's no meaningful difference between 1 bomb and 2/3 bombs, especially if the actual incident was by all accounts caused by a targeting error.