No they did not. I am the grandparent and linked to their comment because they concisely explain how the airline made $150 off two sears instead of $100 while giving Bob the $50 deal he wanted (bay making Alice subsidize Bob).
If Alice used an MCP too, there would be no subsidy and neither Bob gets the $50 seat nor does Alice get her $100 seat
"made $150 off two seats instead of $100 while giving Bob the $50 deal he wanted" is maximizing the amount each passenger would pay.
My post was a response to ProblemExplorer's language, not yours.