It's a business a person starts to provide a reasonable level of income to themselves and their family, to maintain a certain lifestyle.
So this is what lifestyle business means for us: having a good time with great people.
Nothing against small consulting/design/etc. small businesses. But if they're fairly typical, at least figuratively, 9-5 gigs in the office or at customer sites with a few weeks off a year, it's hard to see them as lifestyle businesses.
A startup's main aim is growth. Most VCs won't accept an idea that doesn't have the potential to be worth a billion dollars. One amazing investment must have a 10x return to pay for the 9 shitty investments that failed.
A lifestyle business' aim isn't growth. It's aim is to provide enough money and use a small amount of the founder's time, so the founder can enjoy their life.