I disagree. We've already seen Morph express an attraction to Wolverine in episode 3 so it has been established that Morph isn't straight.
You say the general audience wouldn't know that Morph is nonbinary, why? Because he doesn't "act" like it?
Chances are high that they'll give Morph a male love interest down the line and they're already planting the seeds to show that Morph is attracted to men eg episode 3, but that doesn't mean Morph has to behave in a stereotypical fashion to "express" a queer identity. How is Morph supposed to "express" a queer identity if being queer in itself isn't enough?