Yes and no, we just can't actually discern properly.
For example C'Thun. "Your heart will explode". Obviously back then you'd assume you as the player, but now you could look at it and go... Could Azeroth being something more than just a lump of rock applied then? After all Azeroth is a nascent Titan. She has a wound... the Wound could be on or near her heart that with enough could explode and kill her.
Now with Yogg'Saron, there's a few things that still can be overlooked. And actually, quite alarmed me... Mostly because:
SoundFile: http://www.wowhead.com/sound=15761/ur-yoggsaron-death01
Yogg'Saron said "And all of you, who inhabit this miserable little seedling". Blizzard engineered a nice little bomb that won't be told to players for years. The Old Gods were made out to know also as far back as fucking Wrath of the Lich King... That Azeroth was something more than a lump of rock... and being a "seedling", well easily referring to Azeroth being a fucking Titan. They knew the truth before we did. It may look like a lie but the reality is, we perceive it as a lie even when it could possibly be a truth.
Yogg'Saron also says mid-fight "Look at the true face of death". And in the puzzle-box "Even death may die". Well he was right on both, Yogg is the God of Death and the interesting thing is is the word "may". Not will. And during the Diamond King quest they can hear Yogg'Saron whispering in Ulduar...
Even stupid little things like "There is a little lamb lost in dark woods..." could be referring to Tyr dying and living his hammer in Tirisfal. A lamb to them really considering what happened to Tyr and fighting a C'Thraxxi which also happens to be one right before Yogg'Saron.
If they knew Azeroth was a Titan that Yogg'Saron called a seedling... If they knew Tyr has died in Tirisfal by being a lamb in the dark forest and we didn't even see that big hint. I'm starting to think that actually the Old Gods tell a fuck ton more truths than we give them credit. We just never spot them because we aren't fully seeing the grander picture.