That's not surprising, the man was not even satisfied with what was coming directly from him! (remember how he liked only one drawing of his in the first Art Collection, claiming the rest were failures compared to what he actually had in mind?).
So don't expect him to easily accept even things that are perfectly fine, he's an extreme, ever-unsatisfied perfectionist that can't refrain to come back to his work, that's what he's saying.
He's certainly not saying that
Super is bad, he's taking the blame on him.
He complained about the anime back in
Z, he'll complain in
Super too. Except Super is good enough for him to actually keep an eye on it, when he didn't watch Z at all if I'm not mistaken, even when his kids were. But then again, my memory may be playing tricks on me.
In other words, Toriyama doesn't say
Super is bad, Toriyama says he's just annoying and never satisfied, which keeps him coming back to it. And that's good for us.

His sentence is to be interpreted as "I've been like this for a long time, and even now, I nitpick about the new anime when I really shouldn't". Which is why it's being published in the first place, it is not a criticism on anything but himself.