I get (or at least hope) that it's an exaggeration, but I'm not too keen on seemingly witty phrases without substance that get repeated everywhere.
And if you did tax them at 50% would they have innovated and hired as many people as they have? As a thought experiment, would Apple have been as successful if it were started in Paris rather than in a Los Altos garage? Why doesn’t Europe have more companies valued in the hundreds or billions? Why is there little Silicon Valley-style garage-based entrepreneurship in France? Culture is one aspect, but taxes and regulations are the primary reason. If you tax something, you get less of it.
That's not how taxes, or any law for that matter, work. You don't get to steal from the society that created you by screeching "but look at the JOBS I created!"