Wildbow didn't state that. In fact, he's compared GRRM's issues with later GoT books to the fact that GRRM needed but ultimately decided against/was forced to avoid a timeskip.
Wildbow stated that the timeskip suffered for poor execution and a lot of IRL stuff that was going on at the time (including a semi-forced 2 week break from all internet/computer stuff mid-arc), and he intends to rewrite it and cover different bases for the published final version.
Wildbow stated that the timeskip suffered for poor execution and a lot of IRL stuff that was going on at the time (including a semi-forced 2 week break from all internet/computer stuff mid-arc), and he intends to rewrite it and cover different bases for the published final version.
Source: Am Wildbow.