The fact that you are asking this question makes the answer obvious: No. It has been used on occasion in the past as a magical term, but it has never caught on as popular or widespread.
If you have been in the magic community for years and still have not heard of Cardistry as a magical term, it's not a popular magical term at all.
However, research has clearly shown that the term "Cardistry" has been used on occasion starting in 1913:
- It has been mentioned in 3 publications from 1913 to 1954.
- A magic magazine called "The Cardiste" was published from 1958-1959, and its subtitle included the word "cardistry."
- A magic book called "Cardistry" was published in 2007, over a year after Cardistry started to gain momentum as a non-magical term.
- These are 5 instances (about 19 if you include each issue of the magazine) in 94 years. That's a tiny spec on the map compared to the number of non-magical Cardistry videos posted on the Internet and people who say they do Cardistry intending the non-magical art we know and love today.
So Cardistry has been used as a magical term in the past, but it never caught on as a popular magical term.
But it has caught on as a popular non-magical term. This is evidence that the word is far more apt to describe the non-magical definition.