Google is just really bad at this, but seems to think it's not bad at this. It's sad since there is no excuse for it - plenty of companies conduct regular layoffs and role eliminations in more compassionate ways, it would not take much to survey and learn from their practices. Hell, IBM was often more compassionate about layoffs than Google.
Some of it they've tried to become more formal about in ways that actually make it worse - so for example, the timing of this (which the person complains about) is because (AFAIK) they now have one day a month where ~all role eliminations that are going to happen that month, happen. Or so i'm told this is the case.
Ostensibly so you don't have random role eliminations every day, which makes some sense, but then you have no way for people on the ground to do anything more compassionate (like move the timing a bit) because they can't get through the bureaucracy.
In the end - it's simple - if you disempower all the people from helping you make it compassionate, it will not be compassionate. The counter argument is usually that those folks don't know how to do it in legally safe/etc ways.
But this to me is silly - if you don't trust them to know how to do it, either train them and trust them, or fire them if they simply can't be trusted overall.