Sure, I don't disagree with Startup == Growth. I disagree that it means anything but (such as outside investment, winning the startup/facebook lottery, compounding, putting insane life crushing hours, etc.)

There's a reason PG formulated it thus simply. It would be odd if for instance in the case of Viaweb (a startup without outside funding) PG would disqualify himself from having done a startup, but then went on to define startups...

If we're gonna go there, lifestyle businesses solve real customer needs, usually for other businesses. Startups collect lyrics for hip-hop music. :-)