[Question] EA’s abstract moral epistemology

Does anyone understand this criticism? https://​​www.oxfordpublicphilosophy.com/​​blog/​​letter-to-a-young-philosopher-dont-become-an-effective-altruiststrong-strong? For me it sounds way too abstract, although ironically that article criticizes the ‘abstract’ moral epistemology of EA. Curious about your thoughts.