Not a bad email, and a decent follow up on the ones that are affected. It is also a reminder that killing yourself slowly at the workplace is meaningless. Management has no responsibility to you, and no promise is certain. It’s your responsibility to take care of yourself. My take, don’t be bitter. Take the severance as soon as possible and get back on your feet. Having Google on your resume is a very good thing.
There may be some borderline exceptions with very small companies (less than 10 employees), but in general a company isn't capable of being loyal to individual employees. Just keep in mind that in your relationship with your employer, you only have value insofar as you generate profit for them.