Perhaps, but this isn’t some kind of nitpicky “superfan” trivia kind of thing. It’s a pretty major thing and something that could be easily checked just by referring to previous io9 posts.

[T]he Doctor is on Karn, last featured in the memorable minisode “The Night of the Doctor,” where Paul McGann returned as the Eighth Doctor and regenerated into Chris Eccleston’s Ninth with help from the Sisters of Karn.

You’re correct. That’s a pretty terrible error on Bricken’s part.

He did indeed. Definitely not Nine.

No, the Eighth Doctor REGENERATED into the War Doctor, who then regenerated into the Ninth Doctor.

Pretty sure McGann regenerated into John Hurt’s War Doctor, didn’t he?

As you can see, the Doctor is on Karn, last featured in the memorable minisode “The Night of the Doctor,” where Paul McGann returned as the Eighth Doctor and regenerated into Chris Eccleston’s Ninth with help from the Sisters of Karn.

Paul McGann regenerated into John Hurt’s War Doctor, who sort of regenerated into Eccleston in the Day of the Doctor.