Dear Youdont,
“In the first teshuvah quantifying how many people would be required to live in this 12 mil by 12 mil area, Rav Moshe stated ” (I’ll continue for you.) ” he had said in person that he doesn’t want to get involved because of all the shittos and sefarim are available, but once there are rumors that Rav Moshe is from the mattirim because of he said he is not getting involved, now he is forced to write this letter ito directly explain his own view of the matter. And it is explained at length in his first teshuva at length in every single detail…..”
And in your own understanding, he concludes the paragraph with a completely new number, with no indication that this any new thinking. And then in the first lines of the next paragraph, he calls it pashut and vadei reshus harrabim.
So, he didn’t have this number at the meeting. He wouldn’t have gotten involved. But now he had to explain his opinion…. But it is not the same opinion as he gave in person. It is something that is unsourced and never heard before.
Is this how you read this?