[msaspence]

The key word (that is admittedly missed from the title) is "blindly": 'blindly applying "agile shock therapy" or introducing Kanban will only suck you further into the abyss'.

Which is a bit of truism: do anything blindly and your chances of succeeding are based entirely on luck.

Depending on the specific circumstances Kanban, or any other agile methodology, may or may not be part of the solution to the so called "death spiral".