Of course government should be doing it as precursor. They're claiming that the App Store is anti-competitive. The purpose of competition is to provide better products/services to consumers. So they should be able to show that the prices, quality, selection and customer satisfaction on iOS suffer in comparison to an OS that has 3rd party stores since they are also claiming forcing 3rd party stores is a solution to lack of competition.
Vipergts2207 didn't generally disprove anything. He provided an anecdotal example of Epic briefly lowering V-Bucks prices at the same time that they intentionally violated App Store rules and then made an unsupported claim that the larger number of apps on the Play store is the result of greater competition while also simultaneously admitting that the Play store doesn't really have a different financial/commission structure than the App Store.