I searched around for info on this and couldn’t find anything really supporting your claim. At best I think you can say SO is going through all the same stuff that most other growing startups go through: needing to layoff some workers, pivot product strategies. That they are still raising money seems an indicator there is belief in the products, but sure, they might not make it.

For purposes of evaluating whether open-plan offices are effective, your comment seems at best disingenuous and at worst just some axe to grind against SO.