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"One of the theories I've heard, and someone I think would be really interesting, is Cece being Charles, starting life as Charles and now because of her own gender identity now identifies as Cece. That's a really interesting theory, but I don't know if our show would ever really tackle something like that. It's a really kind of prominent discussion topic in the media right now, gender identity and transgender stories, but yeah, I don't know if we'll go down that road."
It's very likely that Robinson had no idea this theory was accurate — Lucas didn't appear in the first half of season 6, so it's not like Robinson would have gotten a script for the major reveal. It seems like this guy was just majorly perceptive of what was to come on PLL, even if he wasn't totally sure the series would go for it.
Robinson likely knows the identity of Uber A now (especially because, cough cough, HE'S TOTALLY PLAYING UBER A) but if you're itching for answers, they might be somewhere in Robinson's deep cut interviews. This dude clearly knows his way around a good fan theory, even if his words should come with a big fat spoiler warning.