I do have the same fears about Nick's bio, but this is Fatal Opera and I don't believe David's really influenced the sound he's just played on a song which was written a long time ago. From memory it's not that different to the rest of Fatal Opera's stuff which was released before Gar died.
“Bassist David Ellefson and guitarist Chris Poland have come together to record one final song posthumously with their friend and former MEGADETH drummer Gar Samuelson. The new track "The Raven" is the latest single from Fatal Opera, part of a new twelve-song collection of demo material compiled as the group’s final release, entitled FATAL OPERA 3, out now on Combat Records ®.”