That isn't a very useful statistic - all you should really glean from it is that landing on Mars is hard. The US has done it 9 out of the 10 times it tried, so it seems reasonable that it would succeed.
People who don't normally follow space may be confused by recent things re: Starship because the media is being intentionally deceptive, as usual. These are not normal flights. They are purely experimental flights, mostly expected to fail, to gradually work the kinks out of the system. It's the difference between hitting compile and launching something to production.