Yes-- sample size, and effect size. He's saying that the results were strong enough that given the sample size, they were statistically significant.
Simple example: if I have a study of 20,000 people and I find that 51% of people prefer foos to bars, that may be similarly significant to your study of 20 people, all of which prefer foos to bars.
Simple example: if I have a study of 20,000 people and I find that 51% of people prefer foos to bars, that may be similarly significant to your study of 20 people, all of which prefer foos to bars.