Well, further down the page it says:

“We have an awful lot of people internally playing Starfield, working with Todd and the team,” said Booty. “I see bug counts and just by the numbers if it shipped today, Starfield would already have the fewest bugs of any Bethesda game ever shipped.”

The reason they are saying it is because they want people to know that they are working on making it as bug-free as possible and that they understand how much Xbox’s reputation is riding on this.