Yes, poor old engine. I'd replaced and refreshed all of the common LS weak areas along the way (chain tensioner, lifters, Harmonic Balancer, rocker bearings etc.), but rod bolts are a very rare failure point. Whilst there are plenty of LS's that have covered more road miles, mine is probably one of the few that is tracked.
Fortunately, whilst the damage is great, the sentimental value of this engine is important to me, so the block will be welded, crank journal lightly skimmed, polished and checked. I can then soldier on with the same block, heads and 7 of the 8 original pistons. I will likely keep all of the original main and rod bearings, given they have all bedded in together. i will hone the cylinders, put in new rings and see how long it can keep going before the next failure.