There’s still some construction going on under Congress Bridge. You’ll have to take a detour climbing the stairs at the Raddisson.
Yes, I ran the route this afternoon in the humid Austin weather and noticed the detour. We'll run on Cesar Chavez for a couple blocks and then get into the trail at congress.
If you haven't run a 10k before I don't suggest you try it. You can run the 5k and then take an Uber back to your hotel...