This article from the BBC corroprates the claims in the parent article, and also talks about why there are so many civilian casualties at these food distribution centers:
The most obvious problems are that the food distribution centers are placed deep inside military red zones (which is not common practice), and that Israeli soldiers have been ordered to fire at civilians in those zones, even if they obviously pose no threat (which is clearly a war crime).
The sections "Troops describe firing at crowds of aid seekers" and "Aid workers and medics call for end to GHF distribution plan" explain in more detail.
The article you link from NPR seems to mostly cite the Haaretz article. The only possible corroboration are the claims from Adil Husain, but I am hesitant to take his words as corroboration.
The Haaretz article states it is unclear how many died from IDF fire vs the Abu Shabab group. Husain was not at the aid site and so can't state how they were wounded.
If the soldiers truly fired on those who were only running away, not advancing, this should be investigated and charged as a war crime. However, at this point the evidence is not clear aside from a handful of anonymous sources from a single press release.
https://www.npr.org/2025/06/28/nx-s1-5449587/israel-gaza-haa...
The most obvious problems are that the food distribution centers are placed deep inside military red zones (which is not common practice), and that Israeli soldiers have been ordered to fire at civilians in those zones, even if they obviously pose no threat (which is clearly a war crime).
The sections "Troops describe firing at crowds of aid seekers" and "Aid workers and medics call for end to GHF distribution plan" explain in more detail.