The linked study has one "key finding" that "The billion dollar startup companies with an immigrant founder excel at job creation" but I don't see anything in t

The linked study has one "key finding" that "The billion dollar startup companies with an immigrant founder excel at job creation" but I don't see anything in the study to indicate how the job creation at these immigrant founded companies compares to "non-immigrant" founded companies. The provided data appears to just be a table listing how many jobs were created at these companies with no mechanism for relative comparison. Does anyone know of existing evidence to support this claim?