It’s a thing . Threaded rod is used to help prevent further weakness , though depends how badly the tree is affected, splitting can kill parts of tree .
Inherited a long drill , someone had taken a threaded rod and welded it to the end of a 16mm HSS bit , came in handy when I had to drop power cable down into stud wall from the loft .
Some dodgy dealers out there , friend bought a car , turned out it had no cat , exhaust was straight thru , he managed to claim thru insurance so wasn’t out of pocket.
If you use dealers get a verification of address and ownership .