Not really. Exceptions are a controlled way of indicating something went wrong in an application.
The only point where you wouldn’t know about the possibility of one is when you don’t know enough about the language features you’re using or when you use a badly documented library or framework.
While he advocates for it, that’s also a point that Martin brings up multiple times when he talks about his project “fitnesse”.
Basically saying that they left it open how stuff can be saved, but the need has never arisen to actually pivot to a different system.