You seem to be moving the goalposts or talking about something different - we're talking about employer obligations when changing between tipped and non-tipped. I quoted the department of labor to show that contrary to your incredulity, yes all employers are required to increase base pay to a higher rate in the absence of tips. You seemed to suggest that employers would not cover any increase in pay if tips were removed - however federal law requires that employers meet a higher base pay for untipped workers. This is regardless of how well a restaurant is doing - if a Michelin 5 star restaurant pays it's employees 2.13 + tip but decides to go tip free, yes they too will be required to increase base pay to 7.25.

The detail about restaurants also being required to cover the difference between tipped pay and 7.25 in cases where the restaurant underperforms is an unrelated detail not central to this discussion. My quote of the department of labor was only to demonstrate the 2 minimum wages between tipped and untipped pay.