It's very difficult to not have the opportunity to become a millionaire. For example I could have bought a lottery ticket and won the lottery. But I didn't. Likewise, Google hasn't published the Honeycomb source yet.
Also, it is strictly logic, you can follow everything from a false statement (false => anything). So, if Google had released the source for Honeycomb I could have been a millionaire is a strictly true statement.
I think you'll agree that it's much more likely that we'd had Android 3.0 on phones if they released the source code, than that you'd become a millionaire if you bought a lottery ticket. After all, people have done that to previous open source Android releases, I can even install the latest Android release on my iPhone.
Also, it is strictly logic, you can follow everything from a false statement (false => anything). So, if Google had released the source for Honeycomb I could have been a millionaire is a strictly true statement.