Tutorial w/ missing steps: outline stroke

i’m having a hard time with this tutorial. i think it is missing a few steps. the part i am stuck at is the very first Step 1 Arc, Circle, Path Tool. I do everything he says, and after doing outline stroke i try to fill the object but it won’t let me. he said it should turn into a shape but they are still individual pieces.

here is the tutorial

i looked up stuff on the outline stroke but everything that comes up is related to text