T-Mobile’s Ultra Capacity 5G Now Covers 330 Million People

No, it does not.

According to both T-Mobile and the article you linked T-Mobile's 5G Ultra Capacity covers 300 million people while T-Mobile's overall 5G network (which includes the much slower and longer range 5G Extended Range) covers 330 million people.

Here's T-Mobile's statement yesterday:

300 million Americans now covered by Ultra Capacity 5G, achieving the year-end goal more than two months ahead of schedule, while the total 5G network covers more than 330 million people (98% of Americans)

And rivals the speeds of 4g