This is an FAQ where each entry has a TL;DR. For question 9 in particular, the list consists of items and explanation, where the author chose to use <ul> / <strong> instead of <dl> / <dt> / <dd>. This is one of the situations where the "sometimes-bolded bullet point headers" formatting is appropriate. (The most semantically-correct formatting would be paragraph headings, as seen in LaTeX; but HTML doesn't have these.)
The <em> tag is used to indicate stress emphasis. This is the intended purpose for which the tag was added to HTML, not "weird italics". (I type by transcribing my speech, so I tend to overuse this: one of my editing passes is removing unnecessary <em>s.) This article only contains 9 <em>s in 10 questions: of these, I'd remove the emphasis from two of three "well-fitted masks", and reduce the other to just "well-fitted".
Unspaced em-dashes are often used to offset parentheticals – though I prefer spaced en-dashes myself – and these are both long-standing conventions (see https://en.wiktionary.org/wiki/%E2%80%94). Parenthetical dashes are common in formal writing, and this is formal writing.
As someone who frequently wrote in more-or-less this style (where appropriate) before GPT-1 was even made, who's also fairly decent at spotting ChatGPT output, I don't think this is ChatGPT at all. Apart from superficial formatting considerations, it's not the distinctive ChatGPT voice; and the most distinctive part of ChatGPT output is its inappropriate use of voice and formatting, whereas all of these stylistic choices are easily-justified. Perhaps most importantly, it actually says something.
The <em> tag is used to indicate stress emphasis. This is the intended purpose for which the tag was added to HTML, not "weird italics". (I type by transcribing my speech, so I tend to overuse this: one of my editing passes is removing unnecessary <em>s.) This article only contains 9 <em>s in 10 questions: of these, I'd remove the emphasis from two of three "well-fitted masks", and reduce the other to just "well-fitted".
Unspaced em-dashes are often used to offset parentheticals – though I prefer spaced en-dashes myself – and these are both long-standing conventions (see https://en.wiktionary.org/wiki/%E2%80%94). Parenthetical dashes are common in formal writing, and this is formal writing.
As someone who frequently wrote in more-or-less this style (where appropriate) before GPT-1 was even made, who's also fairly decent at spotting ChatGPT output, I don't think this is ChatGPT at all. Apart from superficial formatting considerations, it's not the distinctive ChatGPT voice; and the most distinctive part of ChatGPT output is its inappropriate use of voice and formatting, whereas all of these stylistic choices are easily-justified. Perhaps most importantly, it actually says something.