I don’t see the correlation between fixing an oversight (no exceptional/flawless version because it’s handcrafted) and an exclusive reward staying exclusive. It’s not like the promotional deal said “ordinary Iron and Star Metal versions only, no flawless”. It was never that specific.
But hey, if I had my way they’d release the Father’s Blade as a purchasable DLC, including exceptional/flawless epic versions. Because as iconic as the Atlantean Blade is, the FB is a thousand times more so (to me, anyway).