Anyone can deploy a file with one button. DevOps is what happens when the app starts randomly crashing.
If the site keeps humming along like normal, or the app is automatically rolled back, or (rarely) the devs get a page & quickly diagnose in production and apply a fix in 10 minutes, and deploys don't randomly fail due to unpinned versions etc, that's DevOps.
If people start running around like chickens with heads cut off and pointing fingers, that's not DevOps.
If the site keeps humming along like normal, or the app is automatically rolled back, or (rarely) the devs get a page & quickly diagnose in production and apply a fix in 10 minutes, and deploys don't randomly fail due to unpinned versions etc, that's DevOps.
If people start running around like chickens with heads cut off and pointing fingers, that's not DevOps.