Do you know what grade of copper is used in magnet wire? I don't, but there is nothing onthe web page that indicates it is anything different than magnet wire.
From Speltz's web site ...
"The Difference
The Anti-Cable wire is made of one solid piece of highly annealed, super long drawn, Continuously Cast Oxygen Free Copper."
I would say the key words there are .... "Continuously Cast Oxygen Free Copper."
YMMV