This means absolutely nothing. How much of their advertising revenue comes from the US.
To quote the article again, "The U.S. accounted for about 25% of TikTok overall revenues last year, said a separate source with direct knowledge." Honestly, I think that makes the case for shutting it down even stronger. TikTok isn't in some growth-at-all-costs phase in the US. It's likely near its peak potential userbase. If they haven't been able to make it profitable by now, that doesn't bode well for it ever becoming significantly profitable. Absent the legal issues, they think it's still worth at least trying, but as it stands, it's just a lot of money in and, just as quickly, out, with nothing to show for it at the end of the day.
Honestly I don't get why they apologized at all. This was a lame story yesterday. The apology stretches the story an extra day. Say nothing and nobody remembers the pearl-clutching next week.