Just gives the Harris campaign ammunition against the "Trump / Robinson" ticket.
Trump will do everything he can to distance himself from Robinson and Harris will do everything she can to connect them.
Trump won NC by about 160k in 2016, and 75k in 2020.
If voters are passionate for Trump, they are going to show up anyway. If they are lukewarm on Trump and wanted a republican governor, maybe they still show up and hold their nose for Trump. If they're lukewarm on Trump and now turned off by Robinson, maybe they don't show up.
Polling shows the state as very close right now so it might come down to which party can get the most turnout.