But I don't think the article is using it in that sense. They've simply taken the gdp value between the start and end of ten years and thrown at us the figure of 108%.
It's not a matter of how the article uses it. If they grew 108% over 10 years that's the same as 7.6% every year for 10 years, not 10.8% like you stated.
That only covers a week and a half of new immigrants. What are the other 127,000 immigrants that enter our labor force in May going to do? What are unemployed americans going to do if we are creating fewer jobs than the number of new immigrants entering our labor force?