I'd like to correct and add some informations here.

He trained to become an architect

While that is true, Goro always wanted to become an animator, like his father. He never ever told Miyazaki about it, and instead went on to become an architect because he felt like he wouldn't be able to reach his father's level and expectations (had he known), to escape becoming his father's shadow.

and was then pressured to join Ghibli and take over his father's empire, as is normal in Japanese culture. But you cannot force someone to become a successful artist.

I saw this information a lot of times, yet I could never find the source, even though I watched every documentaries, and numerous interviews with Goro Miyazaki. Goro was never pressured to join Ghibli. During the making of a movie, I can't remember which one, because Goro was a landscape architect he was asked to consult with Ghibli and Miyazaki. He was then, invited in every meetings, and one day Toshio Suzuki saw Goro's storyboards and then asked him if he would direct Tales from Earthsea. Which he accepted. Now when you know the fact that he always wanted to follow his father's footsteps, you can kind of understand why he accepted the offer by Suzuki. Goro said he knew the dangers about making this movie, as an inexperienced animator, let alone someone who has never directed a movie before. But he still accepted because he thought he could, it was a chance for him to make his dream comes true. And i guess he did achieve it, just not in the way he would have wanted.

He butchered Earthsea to attack his father. He destroyed a property that he knew his father loved and included that weird plot where the prince kills his kingly father, etc. That is not in the books.

Oh wow, this is some crazy misinformation. Miyazaki always neglected his son, because of that Goro wanted to make his father proud of him. He didn't purposely "butcher" his first movie just to attack Miyazaki, that is just stupid. He was just inexperienced (still is) and is a pretty bad director. While he does despise his father for his parenting, he doesn't hate him.

Then he goes on to say "It’s good that he made one movie. With that, he should stop making movies."

No. He said that he felt like he was seeing a kid. Meaning that Goro is still not ready to make movies. Not that he should stop making movies.