That looks different. The Data Connector, which you linked, lets you write a query to BQ and have the results in Sheets. Connected Sheets sounds like it's actually a front-end to the underlying data.
Notably, the Data Connector has a row limit of 10,000 results, while the Connected Sheets claim to surpass the regular row limits of Google Sheets in general.
Notably, the Data Connector has a row limit of 10,000 results, while the Connected Sheets claim to surpass the regular row limits of Google Sheets in general.