Obviously the following statement is 'False':
"This sentence contains Seven words".
So we correct the sentence by changing it to:
This sentence does not contain Seven words".
We know that the First statement is False and so now can we conclude that the Second statement is True ?
No one ever said that since the first statement is false the second one has to be true. This is a bunch of mumbo-jumbo trying to confuse the reader. The fact is the second one is in fact false as well. The sentence DOES have 7 words and therefore the statement is false. I could careless that a first statement even existed.
And they say "we correct the sentence" which they don't. If they wanted to correct the sentence it would read "This sentence obviously does contains seven words".