Some points:
1. First, to start, I have a ton of empathy for this person being in an extremely challenging field. He essentially did internal communications for JP Morgan for the last 10 years of their career or so. Any sort of "content creation" role that doesn't have a direct tie to revenue is going to be under the knife at most companies these days. These roles are also the ones that are most in jeopardy due to AI/ChatGPT. There was a recent Washington Post article where it highlighted some copywriters who basically lost their jobs to ChatGPT. It's not "coming", it's already here.
2. Small not-so-secret: if you are beyond the age of 30 or so, and you are a relatively high level professional (this person listed VP on his resume), you should be worried if you don't think you'd be able to get your next job through your professional network. That is, most jobs at this level may put out a job req on Indeed (often for legal reasons), but it's likely to be filled by a referral. Even if it's not a referral, it's very likely that the applicant knows someone through their network (even if a degree or two away) that can serve as a better reference.
Whenever I see missives like this where the author is semi-baffled their "Send my resume to 1000 open positions" approach didn't work, I'm not surprised.