You're trying to phrase this as if those conditions make it any less bad, but they don't. This affected users that were using the latest version and used... features? Give me a break. Every product has bugs, but trying to downplay the issue after you've just read a distressed user of yours struggle with it is definitely not what you should be doing.
There's certainly a failure to test properly from PostHog, as in they have production features that aren't being tested before a release.
On the other hand the author of the article did the exact same thing. They either pushed a release without testing, or they automatically just pull in the latest version of an external library, without any testing or verification. Now I lean towards this being the latter, as if they pushed a release and then the site broke, they would have considered a rollback. Kinda hard to blame others for failing to do testing that you also didn't do.
Edit: So others have pointed out that PostHog will just pull down the latest version on it's own, unless you actively disable that feature. That seems like a brave move.
Yeah, honestly not a good look to come in and “well… actually”. It’s certainly far from a “crowdstrike moment” but tact is still needed when you’ve clearly affected multiple people and their customers with your bug.