Maybe it won't literally destroy their life--and I doubt that's what the parent actually meant, either--but even this ~25% pay cut would greatly affect their life. It's not the nature of life for most people to live greatly below their means, especially over time.
I can attest to the pay cut being impactful. With a teen in private school, the cut means things will be comfortable, but we're dialing back eating out, canceling a planned trip to Europe, etc.