- Questionable Testing: Thing is, the Foundation's motto is "Secure, Contain, Protect" for a reason, it applies to anomalies as well as human civilization. Any test performed beyond the initial D-class invasion (and even that's iffy) runs the risk of destroying the anomaly if the test is successful.
- Wrong Focus: In all honesty, the fact that the village is invulnerable is the least interesting bit here. See conclusions for details.
- Numbered Draft: While not a problem as a placeholder, don't expectvthat number to be free if/when this is posted. SCP numbers aren't typically reserved unless it's been cleared by staff, and of the sort of "the article fundimentally will not work without this number".
Simply put, you're too focused on the fact that the SCP is indestructible, and not enough on the why of it. Why are these people badically invulnerable to attacks? Ritual? Faith? Deal eith the devil? Advanced alien observation outpost that looks like a human village? Simply put, you need to explore more than just the what the SCP is, and go into why it is, or how it reflects the universe.
I'd suggest you read more Series II and III articles, and focus not on what the object is, but what happens over the course of the article. Hopefully that will help you learn where to take this thing.
And just so you know, fixing this will likely require more than just tacking stuff on or fixing the specific things I brought up; you'll likely need to rewrite large swathes of the article once you focus on where to put your efforts.