He is (rightly) upset that bug fixes are not glamorous, and not submitted as often as they should be to WebKit.
Yet the fact that Opera has moved their team onto an open source project, and is actively submitting bug fixes at all, is surely a positive thing?
The alternative is they continue to develop the Presto rendering engine, to which no one but Opera can submit bug fixes, and this bug fix wouldn't have been submitted to WebKit at all.
So surely this move is a positive gain from any perspective? I'm not sure why the negative spin.