If there is a default, it will affect many countries. News is written in advance, not knowing the subtleties. To say whether it is really impossible, there is very little information. Here they refer to the fact that a large bank has gone bankrupt and the rest may fall too.
The US default not only affects many countries, and I would say it will affect the world, the risk of a global economic collapse is very likely. The United States is the country that controls, dominates, and has the greatest influence on the world economy. So once they fall, we will be hit hart.
But the possibility of them defaulting is really very difficult, I do not believe the information spread in the media because politics in the US is so messed up. News is unreliable because the media can be manipulated.