It certainly looks like a “couple hundred bucks” fix not repair. It looks like there is undercut, porosity, inconsistent bead profile, and poor blending, all the ear marks of future failure. Just saying but I wouldn’t be happy with that, at all.
Is there an existing crack or bark inclusion on a codom, how much wood/trunk is below the union? Would it be better to cut off one of the leads? Would it be better to treat the codom as separate trees? Is it safer to bind the trunk with chains?
These are a handful of things I go over before...
Be careful. Do you do any kind of tree assessment before lighting into it with a saw? Smacking the trunk a couple of times with a axe or mallet is an easy way to detect hollows. But being it was rotten and not hollow yet there may have been other signs, insect litter, shrooms, slim flux, are a...