The Tories did change the law on early release, in 2012. They just didn't retroactively extend the sentences of prisoners who'd already been convicted and sentenced. Also, hiw whole complaint was that the Tories didn't publicize his comments and their correct, anti-Tory spin. Finally, the only evidence given of plagarism aside from the fact that both debunked the same claim is that they both linked to the same explanation of how parole worked for extended sentences - which is literally the first result when Googling for the topic. They weren't worded the same, weren't making the same argument otherwise, and the original blog post certainly didn't mention anywhere that Labour had made any of the claims it was debunking.