They do make the point in the article that even upgrading from two generations back is a waste, as you’re getting basically getting no real benefit to having waited two generations instead of one. You may as well upgrade to last generation instead of this one and save yourself some money.
If you’re three generations behind, no matter what your upgrade path is, you’re getting a significant upgrade, but it’s still not worth upgrading to the current gen when last gen is much better value for a marginal performance difference.
The exception to all this is buying the absolute top-of-the-line, which is never good value, but is again significantly inflated in price from the previous gen.