Can black holes trapped by ghosts already be seen in these years of observations?

I read a paper about the evolutionary pattern of the violent disturbances of black holes , such as black hole mergers, ( [2602.12101] Black Holes Trapped by Ghosts ) and my question is : is it possible to check the existence of the pattern shown in the paper for the GW signal in all the observations that were collected through the years or not?

Thank you !