No. It doesn't constitute an upgrade.
I'm fine with going case-by-case, but absolutely no to this.
Enchanting hands is not an amp. You need to
imbue a weapon for an
exponential boost that increases its destructive force 2 to 3 or 10 fold. Percival could enchant his own fists since chapter 3, but that obviously wasn't an exponential amp if he didn't know anything about it until the Cernunnos fight.
Making weapons, like Darkness swords, also wouldn't count because it's just their own magic.
Who says it's because of an enchantment? King always draws out the power of the Sacred Tree, he's just
releasing his Sacred Treasure and
drawing upon more to increase the strength of his general techniques.
That's not proof. It's always imbued no matter what, and Form One is stronger than his other techniques in general.
Anyway, this is getting tiresome. Leave this discussion for later so we can thoroughly go case-by-case.