You are thinking in the wrong direction. You are focusing on that "one app that will make you rich". The post tells you to think in terms of network effects: instead of asking "how can I get installs for my main app?", you should ask "how can I leverage the work I already invested in my other projects into boosting my latest project?"
Yes, there is a bit of a chicken/egg here, but getting _some_ installs for an app really is not that difficult.