The blogger, who provided no proof that he or she had written the original piece, claimed in the second blog to be suffering from bipolar disorder.
The new blog was also posted to the anonymous JustPaste.It website.
In the post, the writer offered his "sincerest and unreserved apologies to anyone who read that document and for all the distress and hurt I've caused to so many people. But in particular, Ronan Parke and his family, Mr Simon Cowell, SyCo, Sony Music and everyone associated with BGT."
He or she claimed that being in a manic phase of their condition meant that they "believed everything I was seeing and hearing was fake and contrived in order to dupe and manipulate the viewers".
"I became over-occupied, if not a little obsessed with my feelings about BGT," the piece continued. "I began seeing fans of the show as 'morons' for perpetuating, on Facebook and Twitter, what I saw as Simon Cowell's 'cancerous manipulation'."
They added: "Even if the authorities wanted to catch-up with me, I doubt they'd be able to, as I always mask my true IP Address with someone else's. So that doesn't bother me too much.
"What deeply troubles me in all this though, is the hurt and distress I have caused to *so* many people, including a young lad. This is wholly unforgivable of me and I'm finding that aspect of my actions particularly difficult to live with right now."
The poster claimed that they would preserve their anonymity out of fear of being sectioned under the Mental Health Act. They also posted a link to a UK National Health Service Choices page about bipolar disorder.
Syco and Sony issued a statement threatening legal action to prevent publication of allegations that Ronan Parke had been signed by the company in advance of this year's reality talent contest.
Cowell said that he was "sick" about the "poisonous" and "malicious" email.
A label insider claimed that there had been "good progress" in tracking down the blogger and that "there's no way this person will get away with this".
Jai McDowall, the eventual series champion, later insisted that the fix claims did not help him win.