"With our culture of bringing our whole selves to work and seeing team as family, with shared values we live by,..."
In the American business world, you are an employee until you aren't. Confusing being an employee with being "family" is a mistake, both for the company and the employee.
When times get bad, companies do what it takes to survive, including throwing employees overboard. That's just a fact.
Buffer may have thought it was different, but that flow-chart of how they decided who to layoff was entirely about how an employee can help the company, not how the layoff would affect the employee. That's not how normal families make decisions.
I have no problem with any of that, but anyone who thinks that way has another thing coming.
All of this isn't to say that Buffer was thoughtless or callous in how they handled it. From the outside, it looks like one of the better handled layoffs I've seen.
But still. Don't confuse your job with your family. It's a business relationship that is only maintained as long as it is in both side's interest to do so.