you basically have a 100 percent chance of detecting something in 10 years
It can't possibly be a 100% chance, for something that is only *predicted* to happen and has never been detected before.
They might say their models show a 99.99% chance that everything will be aligned for an event the model predicts - but there's always a chance that something in the model isn't what they expect, or something in the universe isn't what we expect. With our current state of knowledge, 95% of the universe isn't even observable yet.
Of course, if in ten years' time this signal isn't detected, we will have learned something new, and that's good. But it is pretty arrogant to say with certainty now what may or may not be observed.