It's necessary to be able to differentiate from the kind of abstractions you posted and actual minimalism, so I see no reason to dilute the term. Minimalism is typically more about breaking the medium down into its components, going deeper than breaking surface composition down to visual components like shape and color. There are some artworks that sit on the line, but what you posted just seem like basic abstraction. This book is a pretty good history.
It's necessary to be able to differentiate from the kind of abstractions you posted and actual minimalism, so I see no reason to dilute the term. Minimalism is typically more about breaking the medium down into its components, going deeper than breaking surface composition down to visual components like shape and color. There are some artworks that sit on the line, but what you posted just seem like basic abstraction. This book is a pretty good history.