As far as the blade portion goes what it'd take is having a new closed-die milled for whatever equipment they use for forging.
The sides of the eye,that are so much thicker in newer axes vs the older ones may be a different story;i really don't know much about it but allow that the closed-die forging may have certain limitations having to do with plasticity limits of heated steel where in order to fill the die or some other issue some minimal thickness must remain.
But most probably it's all rooted in finances/marketing side of equation,not enough people care or know the difference and it wouldn't be justifiable expending resources in sucking up to the small minority that cares.
Long ago there used to be a CT video on Utube showing some steps of their production process. It has timed out since or was taken down or whatever,i can no longer find it. But what equipment it showed appeared to be pretty rag-tag,a pretty widely varying mix of very old to fairly new.
It did not look like the company was exactly filthy-rich,a bit of a hard scrabble outfit was the impression that i was left with.
An entire new die may be a pretty big deal for them.