I recall that in the first release that supported LISTEN/NOTIFY there was a performance issue around it (poor locking IIRC), which today the "bad post" mentioned in here corrects in a errata just after their first paragraph.
Since the correction apparently dates from May 8th, I think that a post from July 24th might want to acknowledge that the popular post asserting this feature doesn't (didn't?) scale was not made in bad faith or was even wrong about their claims at the time.
If you mean the optimizations coming in Postgres 19, the original post addresses this:
> As an aside, there’s been some online discussion of a Postgres patch (https://github.com/postgres/postgres/commit/282b1cde9dedf456...) related to this issue. This patch (to be released in Postgres 19) does not remove the global lock or fix the bottleneck we observed. Instead, it optimizes the narrower case where there are many notification channels and each listener is waiting only on a specific channel.