I will be offering little to no support on this product because it was free, as well as it was used as a geometry node study project. All other non-free products have 100% support, so please check out other products if interested.

Basically, you are using a curve object, not a mesh object. The way to get around this, use only one churro per scene, I know not ideal. Or use vertices instead of curves, then in the geometry nodes, use Mesh To Curve. Then apply.