The wiki doesn't contain any information about Jahmyr Gibbs missing practice with a shoulder injury or any Week 8 injury designation. Here's what I can tell you from what's in the wiki:
What the wiki does say about Gibbs for Week 8: He's on pace to break Chris Johnson's single-season scrimmage yard record (2,509), has 5,919 scrimmage yards and 58 TDs through Week 7, and is chasing a historic milestone against the Vikings this week. There's no mention whatsoever of a shoulder injury or missed practice.
The injury news you're referencing doesn't appear in the wiki's current content — it's possible this report came from a source not yet ingested, or the shoulder issue was minor and didn't make the cut. If I were you, I'd check the latest Lions injury report from a beat reporter or NFL Network update closer to kickoff. Based on what the wiki knows, Gibbs is expected to play in Week 8 and is chasing history against Minnesota.