Hi ExasperatedCrocodile76
In terms of the Alias, yes, you don't need to specify one. Recently we changed things that if you do add an alias, the dataset alias and ID will automatically be added in the experiment manager. So it's more a print that says: "hey, you might want to try this!"
Second, this is my own version of the example that's no longer maintained. The official version is here: https://github.com/allegroai/clearml-blogs/tree/master/urbansounds8k
We changed the link in that video description as soon as it was moved, but it seems you were one of the early viewers 😄
Third, could you try to run the example from this new url/repository? There were some fixes in there since launch. If it still doesn't work, let me know and I'll run the example myself to try and reproduce 🙂