WoD is in the Void?

[Fenral]

So how do you explain him still being sealed in Amdapor after Void Ark if you do them in the reverse order?

You can't. It's called patch continuity. They may fudge the details for new players to prevent spoilers/lockouts, but the order in which events canonically take place isn't influenced by the order players do them in.

[Frederick22]

So how do you explain him still being sealed in Amdapor after Void Ark if you do them in the reverse order?

You can't. It's called patch continuity. They may fudge the details for new players to prevent spoilers/lockouts, but the order in which events canonically take place isn't influenced by the order players do them in.

she said that we are not the reason why Diaboos scaped. Diabolos could have scaped event if we were there or not.

[Anonymoose]

At certain points, the game assumes that patch release is the canon content order.

Knowledge discerned by the Sons of Saint Coinach and NOAH via the Crystal Tower is discussed by Alisaie in Coil regardless of whether you've done it.

[Alberel]

Historical Amdapor is no requirement for Void Arc.

There is a slightly difference in the dialog with Cait Sith afterwards. But he is in the Arc even without doing historical Amdapor before.

So we are not the reason Diabolos got out of his seal.

I was quite explicit in my post that he would have escaped eventually regardless of our presence. I merely pointed out that in order to reach Diabolos in Amdapor we had to break the seals on his prison. We quite literally smashed them all as we made our way down the platforms in the final part of the map. The entire reason we were sent there was because Diabolos was breaking free so we released him with the intent of destroying him; instead we only severely weakened him and he escaped.

By the continuity of the game assuming you have played everything that comes before we DID free Diabolos. That is the canon story, regardless of whether you personally cleared the duty prior to the Void Ark.