I'm thinking about canceling my Alaska Visa card.

Reasons:
- I currently have MVP status with Alaska, so many of the card benefits I care about (like free second piece of luggage) are covered by the MVP status
- I have a lot of Alaska miles saved up, so will probably mostly book flights with those miles and might not get to use the companion certificate

Does that make sense or can anyone think of a good reason why to keep the card?

Also, just to double check: Canceling my card will not forfeit my collected miles, correct? I found this article (see screenshot) which claims that I'll forfeit my miles by canceling my card so now I'm pretty confused.
My assumption was that the miles in my Mileage Plus account will not be affected and as long as I have one qualifying activity every 24 months there wouldn't be an issue. Correct?

This article I found claims that canceling the card will forfeit collected miles. I hope that's not true.