I thought your article was good and your style of writing is good as well but I think you should write a follow up post on Pinia instead and tell your readers that this is the official and recommended approach for state management in Vue.
I would prefer supporting an application that is already using Pinia rather than spending time migrating code from Vuex to Pinia.
It is better to teach them the correct approach rather then letting them find out by other means that what they have learnt from your article is out of date with current practices.