Can we broadcast two messages using NOMA? Is it possible for a transmitter to broadcast two messages to a set of receivers at the same time using superposition coding (Non-Orthogonal Multiple Access - NOMA)?

A transmitter has two messages $m_1$ and $m_2$ that wants to broadcast to a set of $n$ receivers. I think this not possible even for $n=2$. If the transmitter broadcasts $P_1m_1 + P_2m_2$ with transmit power factors $P_1$ and $P_2$, then only the receiver with higher channel gain can decode both $m_1$ and $m_2$. Is this true?
There is a THRESHOLD, both can receive. If that would not have been possible why would NOMA be so popular, What is the use of NOMA then? Well, theoretically is possible however practically such channel state information is not available, that is what we read, however, I haven't seen whether that practically possible or not, Energy-Efficient NOMA Systems tells exactly what you have just said.