OP's link is fine. They wanted to show off what the project actually looks like instead of just a link to some files to download without any additional context.
Ah, I misunderstood and see what you're referring to now. It looks like the way YouTube auto-truncates URLs caused the link to get mashed into the next line of text on the preview Lemmy fetched. As others mention, that's more of a Lemmy bug than anything.