Most modern wars see MORE than 1 civilian death per militant death. This pager bomb was nearly entirely militants.
These bombs went off right in front of civilian population with no regards to children or women.
Close to 3000 wounded. Wounded include children losing limbs.
That seems like an awful lot of explosive power for something that needs to be secretly added to a functional pocket pager without affecting external dimensions or adding perceptible weight.
Cautious skepticism is warranted, given how profitable some parties would find it to make such claims regardless of whether they are true or not.