I spelled it out quite clearly.
If the 2010 census number of 309 million is believable, then it means that there were less than 13 million immigrants - illegal and legal combined - in the past decade.
It means that wild-eyed claims of 20 or 30 million illegal immigrants alone are completely insupportable.
I would also point out that - given the assumption by most observers that the majority of America's illegal immigrants are Mexican - the Mexican statistics on emigration imply 3.5 million illegal immigrants.
First, if someone tells you they don’t get what you meant, you didn’t spell it out quite clearly to them, so to tell them that you did misses the entire point of communicating which is to communicate. You can be a jerk and come back with a snappy little answer or you can just rephrase, in case you weren’t clear. I know it must be difficult to imagine that you might not have been clear to someone, but it happens.
Second, you said they were undercounted, so how do we know anything about their numbers? And I’m done taking to you since you apparently think whatever you say is correct and above discussion. What’s the point of having one?