It doesn’t cover the reality that nearly all your extra pay in a progressive tax system goes to the government.
UK is hitting 70% marginal rates , or even 1000% for people with children.
That feels tangential to the article and not super relevant. Whenever you're offered something with more pay it'll be your personal decision whether or not the pay justifies the role change or whatever.
Some would argue going from a regular SWE to a Senior, Lead, or Staff is also not worth the pay depending on how it impacts your life.
But by the time you're ready to be promoted to manager, you're usually at least senior-level, if not higher. No one is (or should be) getting promoted from junior to manager.