Not OP, but this passage is representative. The authors' claims here are:
(a) the contrast between patients at Malanje Provincial and St Jude is "absurd". The authors don't explain what in particular is absurd about it. This is basically the style of argument employed in the article, which mostly amounts to "EA is self-evidently wrong" without elaboration.
(b) Friedman presumes that St. Jude donors are "callous". This is clearly unfounded, since the quoted passage is consistent with the idea that St. Jude donors are (say) well-intentioned but culpably ignorant. This is another thread in the authors' arguments - roughly, "EA takes issues with X; X is obviously good; therefore EA is wrong". This is a generic argument that could be employed against any position that isn't a bland endorsement of totally conventional morality, and is another version of "EA is just wrong".
(c) Friedman supports his claim with "nothing other than a decidedly skewed morality." This is overtly false, since Friedman's argument is almost certainly defended via some sort of EA premise, like, "saving more lives/alleviating more suffering (per dollar donated) is better than fewer/less." Not an unassailable argument by any means, but the author's don't assail the argument so much as deny that it exists at all, except as a morality that they flatly assert is "skewed".