That's most of the reason for the first item: "don't ask for a job, or approach these conversations with the goal of getting a particular job."
Many people, introverts included, would want to be approached by someone genuinely interested in their opinion about, "how to approach job search as a Jack-of-all-trades?" even by people they have little connection with.
(As the sibling comment points out, these conversations often benefit the person you're talking to as well, even if you are asking for a job. But that's not the specific point I was trying to make since it relies a little more IMO already having stronger connections.)
I used to struggle with this too. What helped me get over it is realizing that this is completely backwards. At every company I've worked for there has been a near-constant need for good people. When a former colleague who I know does good work reaches out to me about jobs at my company, I'm thrilled to have a conversation with them.
Even aside from any degree of friendship, this is nearly always a mutually beneficial situation. If it works out, I get a new teammate who I know is good (lower risk than hiring someone random). I probably also get some kind of kudos (generally even a bonus) from the company for the referral.
I believe the introvert's response here is "I wouldn't want to be approached if they're just looking for work"