Not a disaster. Turbinado is just cane sugar that hasn't been refined to the white stage. Not adding it will knock your ABV about 0.9% and the difference in hop utilization is minor. Since cane sugar ferments 100%, what you have now will be slightly less dry.
Adding it now is ok.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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