No. I still disagree. Let's differentiate here: What @chuckwurt described (similar to what happened to REG) is not merely a Lazarus -- it's a "Lazarus With Benefits."
Lazarus: ball drains between the flippers or via the outlane, and rebounds back into play between the flippers due to no nudging from the player.
Lazarus With Benefits: same as a Lazarus, but only applicable to an outlane Lazarus that also triggered a ball-save.
If you simply have a traditional Lazarus in MB, then yes, you have two balls still in play when you should have only had one ball. Play on.
But with an LWB, you gained one additional ball in play that you shouldn't have had.
Do you get to play a multiball with an additional ball in play if the trough gives you two balls instead of one to begin your multiball? No. Same principle.