In other words, you have no proof.
Rightscoop.com posted an article about Lee on the anniversary of his birthday. Your blogger was the first person to comment (probably does regular searches for mention of Lee, so he can jump in). The guy was raving like a loon.
If a nut like that was my "source", I'd keep it shut.
The source would be Lee’s slave ledgers, written by Lee.
I recommend you read Pryor’s book, written after the Lee family gave her access to Lee’s papers.
Some people are more outraged than others by what is there.
Some people are more disposed to make excuses.