just do a 'software developer' search on linkedin, it has 156000 jobs, then filter it via 'remote' it drops down to 24400, that's 15%.
Have you based your job search exclusively on HN's "Who is hiring"? If not, I'm not sure how you can make such strong assertions about the distribution of remote jobs on that specific job board. The article doesn't make any claims about the job market outside that data set.
I think it's likely that remote jobs get filled much quicker since they by definition have a larger candidate pool. At any one moment in time there may be 4x non-remote jobs posted, but if they take much longer to fill and the ratio stays the same, then 69% remote is very believable.
Your comment was actually interesting, but the way you worded it was both confrontational and made it off topic.
It would have gone better if you said "That's interesting, in the wider job market I've found ..."