That is exactly how all of the trans people in my life and social circles use it. Anyone who transcends the gender they were given by others in their early life is trans. Non-binary people, agendered people, genderfluid, self-defined… It’s all good.
I’m very aware that there are trans people who don’t see it this way: who think that there are rigidly defined ways to be trans, and believe that other people’s diversity is somehow damaging to their own struggles. But as loud as they are sometimes, the ‘truscum’ are really a sliver minority in the trans community. I don’t associate with any or take them seriously. Go with your instincts, proudly own the empowerment of being transgender, and celebrate yourself. You deserve it!