In general, yes: the tripod socket on a DSLR is usually strong enough for a sling strap when used correctly. Several photographers use this setup successfully, even with heavier bodies, as long as the screw is tightened securely and checked regularly.

The main caution is with heavy lenses. If the lens has a tripod collar, support the camera/lens combo from the collar rather than the camera body’s socket. Hanging a heavy lens from the body mount puts extra stress on the camera.

There is at least one reported case of a tripod socket assembly coming loose, so while failures seem uncommon, they can happen. Practical takeaway: a tripod-socket sling is generally safe for normal use, but inspect the mount periodically, keep the connector snug, and use a lens collar for heavier lenses. If you want the most conservative option, a side lug attachment avoids relying on the tripod socket entirely.