>>57565
To be clear the plans for the Teen Titans being part of the DCAU didn't make it into the final product. It was something they started discussing during production and then scrapped after the initial planning because the studio didn't want a crossover episode for Teen Titans before the series aired, but there's still that reference to Robin being with the Titans in Static Shock as a result.
That line about Robin being with the Titans in the first episode of Season 3 of Static Shock probably got left in because the voice lines had already been recorded and the animation done.
https://jl.popgeeks.com/episodeA/episodeA.htm
Dwayne McDuffie on "A League of Their Own": "I remember Alan Burnett was in the planning stages of a Teen Titans crossover and the concern was voiced that the Static episode would air before Teen Titans premiered. Someone from the studio asked how we felt about doing Justice League instead and I guess it's obvious how we responded. I'd still like to see Static meet the Titans someday, though. [As it currently stands], it's a large-scale story worthy of the Justice League, but it's fundamentally a Static Shock story. It will feel like two episodes of Static Shock with cool guest stars."
TLDR; The Teen Titans cartoon being part of the DCAU never got past discussion during production, but it's why that throw away line about Robin being with the Titans is there. If they had gone ahead with it Robin in the Teen Titans would have definitely been written as Tim Drake to fit the DCAU's continuity.