Most things antitrust are incoherent and illogical. The unofficial plan seems to be literally to find market leaders who are offering substantially better products than the competition and then attack them for unspecified and likely immeasurable gains. Whether or not we've seen benefits from past antitrust actions, I don't believe measurements and observations of the actual outcomes are part of the debate. There is just an assumption that because they happened and big companies are bad ergo the outcome must have been good.
The article alludes to Google's 92% search engine market share as some sort of concealed monopoly. As a problem, this doesn't make sense! There is absolutely nothing stopping anyone switching to another search engine except the other search engines aren't generally very good. Google is better at providing search results than they are. Or presumably it is, I don't know since I stopped using Google Search a long while ago. This is a monopoly only in the sense that everyone agrees Google is a better option.
The problem with Google is that it is likely integrated with the US intelligence services. No antitrust suit is ever going to attack that; because it is the part that the government supports.