How is Zn not a transition metal?
Zinc in the +1 oxidation state is $\text{[Ar]}3d^{10}4s^1$, and even in its highest, most common known oxidation state +2 (which the quoted values above seem to have forgotten) it's still $\text{[Ar]}3d^{10}$. No known zinc species in what we normally consider the realm of chemistry breaks that complete $3d^{10}$ subshell, and we would need a major revamp of our calculations and models if any ever does.  Moreover, the thermophysical properties of zinc also betray a loss of transition-metal character.  Zinc is just not a transition element.