Nothing in life is guaranteed.
If you think there is, I have a jar of magic beans to sell you.
Seriously though, even sponsored cadets (where the airline pays for the cost of training) will be out on their ear if there's a second Covid or 9/11 type event. A relatively unknown school in the Czech Republic where you pay the course costs is not going to get a higher success rate. And nothing is guaranteed, no matter what shiny marketing says.
Their webpage is also all over the place. In one place, it says guaranteed job. Yet in another part, it says guaranteed interview. They are to very different things. Then they claim to have a 96.1% success rate - though I am not sure what that is supposed to be in relation to.