No, the Dagor Dagorath remind ever what you called Armageddon and the Old-Norse mythologie Ragnarök.
What changed was only the time of Túrins resurection. At least Andreth said he would not come into the War of Warth to slay Ancalgon.
The Second Prophecy of Mandos was never changed by Tolkien, but that must not mean that it was still valid. But it is also never said that Andreth sayings were ever true. We are dealing with (invented) prophecies and not with any (how much ever blured) account of (invented) history.
Respectfully
Findegil
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