No idea what a meatcube is, and google is no help. ChatGPT however says 

> Based on the context you provided, it seems that "meatcube" is being used as a slang term for a piece of writing that is dense or meaty, meaning that it contains a lot of substance, information, or detail. This is in contrast to a piece of writing that is more concise or streamlined, which might be described as not being "meatcubed."

It's worth noting that "meatcube" doesn't seem to be a widely used or recognized term, and it's possible that it is a made-up term used by the writer of the text you provided.

... Maybe you should have asked ChatGPT to critique your posts, rather than requesting a rewrite.