Well, it's questioned, it's not outright denied.
It is included in Inquisitor Kravin's diatribe 'Lessons of Strife', though other Inquisitors and representatives of the Ultramarines themselves have questioned its validity. The original document was purportedly discovered in a system earth-ward of Eskrador.
But
Shortly after the conclave, Inquisitor Girreux publicly accused Kravin of consorting with traitors and conspiring to organize cultist uprisings on the worlds of Kartha IV, V and Archos II in the Korren sub-sector. Girreux challenged Kravin to appear for trial and face the evidence against him, however Kravin's current whereabouts is unknown. Of course this development has called into question the reliability of all Inquisitor Kravin's research, and as he was the leading scholar on the Alpha Legion's history and current activities, much of what was known about them must now be considered a lie. If, as Girreux claims, Kravin has been compromised by the very traitors he sought to investigate, then everything he said must be considered misinformation and propaganda invented by the Alpha Legion
So it's entirely possible that, yes, like we said, the entire thing was fabricated. What better way to cover up that a Primarch is still alive by confirming that he has been killed, by the hands of another Primarch no less. Of course, the
IA articles were written long before Omegon had been on the scene and any of the
HH series. But if the account of Eskrador were true, Guilliman would not know that Alpharius had a twin and that he would have been convinced that he was facing Alpharius himself.
4th company 3000pts
3rd Navy drop Command 3000pts air cavalry
117th tank company 5500pts
2000pts