So how do I fix this? You still haven't replied.
Viewing post in v6p9d9t4.ssl.hwcdn.net took too long to respond.
No idea. It's not something the generator does, it's rather itch.io's thing. But since the issue persists and nobody else reports it, that doesn't look like a temporary itch's glitch. As I said, I have no idea what it is, but you still should be able to use the "non-itch" version of the generator: https://watabou.github.io/city-generator/.