No, it is not. Dish Acquired Boost mobile and is building out its own nationwide...

ac29 · on March 10, 2021

This says they are using the T-mobile network: https://about.dish.com/2020-07-01-DISH-enters-retail-wireles...

bgorman · on March 10, 2021

As part of the T-Mobile/Spring merger T-Mobile agreed to give Boost access to its network while Dish builds its own 5G network. This information is everywhere on the internet.

https://fortune.com/2021/03/04/dish-5g-mobile-cheapest-servi...

Even the article you posted mentions this in the headline. I have no idea why you feel the need to be so disingenuous.

Dylan16807 · on March 10, 2021

Who's being disingenuous? You both seem to be basically correct. They're new, they're building out, but currently they resell.