Yes, that is a good image. I don't think litteral seppuku is called for (though it is a helpful reminder of what shame has looked like in the past), just that people are getting a bit tired of executives saying "I take full responsibility for this failure," while getting handed a giant bonus, a pat on the back from the board and shareholders and another biz mag feature.
Full responsibility is a samurai killing himself painfully while his best friend cuts off his head to end his suffering. That's full responsibility.
This is, "I fucked up guys, here's 3-6 months pay and some benes... my bad. And yeah I know I fucked up last year too, but I took full responsibility then as well, so it's all good..."