Take a look at the back...
Sammy was acquired by the White Sox in a trade with the Rangers on 7-29-89. The Cubs got him in a trade with the White Sox on March 30, 1992.
My guess - the person writing the back of the card saw that Chicago got Sammy in 1989 and just assumed it was the Cubs.
So, my semi-annual plea to Topps - please allow me to proof-read anything Cub related and I'll improve your accuracy, assuming that accuracy is important to you.