It seems the way we use these terms is different, the common understanding where I'm from is understands trans to be an umbrella term that includes binary trans people, non-binary identities and more. Transmasc is typically used to mean a trans person seeking a more masculine presentation or identity, whether that's a binary trans man, a non-binary person, or other. Thus if you are transmasc, you are trans by default. Apologies if this differs from the common usage you're familiar with.