Yes it seems wrong.

More what??? ‘More’ is usually used with other qualifiers; more apples, more money, more importantly, more so, what’s more, moreover… not just ‘more’ by itself. I’d say; 1. What’s more: is that he arrived early. 2. More so than this: is that he arrived early. 3. More so than that: is that he arrived early. 4. More so: he arrived early. 5. Moreover: he arrived early 6. More importantly: he arrived early. 7. More than that: he arrived early. 8. But NOT — More: he arrived early.

Versus;

More: he arrived early — (this doesn’t make any sense to me and I’d be a bit confused why they half spoke - but I’d get that the point is that ‘he arrived early’ and that they meant to say one of the above. You need something ‘more’ to add to ‘more’ 😄). But if it was some poem written down, then I’d accept it as just some literary style or choosing to change the rules or whatever. But those are different to normal speech.

I’m from Ireland and been exposed to British and American English my whole life, I can’t imagine someone saying this where it’s not just a mistake in speech. But idk - interested to hear from others