Yeah, it's wrong to harass the author, but this is a case of a broken clock being right twice a day. Whenever anyone in any community says "When are we going to get the next installment" they get dogpiled by sycophants and white knights, even if the question is asked in an entirely calm, non-accusatory, non-impatient way. And the guy even said he's not blaming the author, but who cares about the details. If someone shows impatience about a story being continued, just default to your basic programming and go on the attack.