What a flawed analysis! Four main reasons for this:
To summarize: In order to see how nintendo has been doing since the switch era and compare to older systems, you will need:
a. To wait until the end of the switch life cycle and see total sales.
b. To add to the above figure all 3ds sales since March 2017 (switch release)
a+b will be exceeding the wii numbers most likely with the momentum of sales and due to the reasons that I have explained above.