Bolvar’s fate is not exactly public information ((at best it’s a rumor, if you ask the guy in SW cathedral))
But the statue only refers to his death, yes? After all it’s both him and Saurfang there. Unless you mean the cinematic, but that’s just a game-mechanic thing similar to Deathwing’s jaw-bit?
Yes. This is the rumor I was speaking of:
Only the Dragonflights and the people in ICC knew that Bolvar was alive after the Wrathgate; and even less of them knew what happened when Arthas was defeated.