Seems like all that's left of a database after the attack is some generated indices or other data structures with their names ending with "meow".

Cats like to knock things off of tables.

Because it deletes data and only leaves records saying "meow".

I believe they rewrite the records in the unsecured DBs with "meow".

Yeah, it was kind of amazing how the article never explained what exactly "meowing" entailed, and just left readers to figure it out from context.

Because cats are cute and likes to swipe things off a table.