The parent was noting that most of the US lives in a region, that is under a monopoly of wireline ISP (DOCSIS, FTTH). Starlink can't shatter a wireline monopoly because it is OTA.
I fired my DOCSIS provider for starlink. For many consumers the service is fungible.
A single extra provider does not mean a monopoly is "broken". Especially if they aren't even competing in the same niches