That's not what this is. (The person you're responding to didn't read the article.) They're not looking to add a "total-er destruction" category; they're looking to replace the current scale with one that takes into account more factors than just wind speed, such as storm surge and flooding. Under the current scale, a category 1 hurricane can be deadlier and more destructive than a higher-category hurricane. They want to use a different scale that better indicates the dangers. It goes up to 6 when multiple factors rate 5 on each factor's specific scale under the proposed system.

I think the title of this article is misleading and clickbaity. :/

Category 6 could also be useful in that it implies multiple threats to avoid.

Evacuation strategies for a cat 5 that’s just storm surge is very different than one that is wind and rain. Either way you lose the city, but with the latter, moving to high ground won’t save you.