Note that this is failure to deliver on time, not failure to deliver full stop.

I also think a lot of places claim to be agile, but don't follow or understand the principles at all. Another commenter here is the perfect example of that where they say the opposite of what's in the agile manifesto and claim that it's a representation of what it says.

Maybe that's a fundamental problem with agile. It's just a set of loose principles rather than a concrete methodology being pushed for by a company and it has therefore been bastardised by consulting companies and scrum masters claiming to teach the checklist of practices that will make your company agile. Such a checklist does not exist, it's just a set of ideas to keep in mind while you work out the detailed processes or lack thereof that work for you.

For anyone that wants to refresh their memory on the agile manifesto:

Individuals and interactions over processes and tools

Working software over comprehensive documentation

Customer collaboration over contract negotiation

Responding to change over following a plan

That is, while there is value in the items on the right, we value the items on the left more.