I think the difference is that people give authors advice prior to writing an article which amounts to "be mindful that your readers will have to read this". And given that authors have a broad range of readers, it's perfectly fine for an author to consider this and still go ahead with something that's long form and detailed because there's a good chunk of their readership who actively appreciates it (and possibly expects it given patio11's typical article length).

Essentially, claiming the author shows you a lack of respect is disrespectful of the author for the work they put into it. Who has the greater onus to offer respect: someone who actively works to put out free in-depth articles that nobody is under any obligation to read, or those who passively consume those articles? Those who wish to read short announcements can simply say "Great post with lots of details, but is there a channel I can subscribe to which gives me short announcements?" That demonstrates respect.