It's less impressive when you convert back to petabytes. When you do that starlink is "only" about 20 times slower than that single trans-atlantic cable.
Interestingly, it's possible that starlink routed ping times could be less, as propagation speed on fiber is only around 2/3rds the speed of light. So if the end to end path length is roughly equivalent between the two (and LEO radius is a relatively small addition to the radius of the earth) it could be faster.
Certain companies would pay a lot of money to be a few milliseconds faster than their competitors if they need to react quickly to foreign stock market fluctuations.