No it isn't. Please read the article that begins this thread, keeping a close eye for the phrase "when he wrote the columns."
The Grahams do not write every article in the Washington Post. There’s a difference between Publisher and Author.
The Washington Post is called "The Washington Post", it is not called "The Graham Family Newsletter."
If it were, and if it contained no bylines, and if it were only a few pages long and only published monthly, then I would presume that the Graham Family authored it.
There are, after all, hundreds of newsletters published in the name of specific individuals which are entirely written by those individuals each month.
Paul's friend and associate Joe Sobran, for example, writes a monthly newsletter called "Sobran's" which is authored entirely by Sobran himself, unless he specifically gives a byline to a special guest.
They assumed that “he wrote the columns” - they would be mistaken. It’s all cleared up now.
If Paul had said “I wrote the columns” it would be a different story.
You can “presume” that Ron Paul wrote the articles, but there’s no evidence to prove that.