He really is an idiot.
If he was an idiot F1 wouldn't be what it is today. With Bernie you need to be able to read between the lines. He opposed the engine switch so him calling the first test a farce – which it really wasn't that far from... – is just his way of telling his oppononents I told you so. And his point about fuel saving is a typically cheeky Bernie comment. One that actually has a point with the point not really being the point...