The bike was run out of oil. No doubt. We've now seen several of these.
The crank is indeed splash lubed. There is a pressure feed to the rod bearing, although it also run in the oil bath. This feed runs oil up the rod also.
The other pressure feed runs up the back of the cylinder, in the external line, then lubes the intake camshaft, runs though the little tube to the exhaust camshaft. The r/h bearing is the end of the line, and this bearing always goes first when the oil supply dies.
all the best,