Once an iPhone has deleted all personal information, does it go back to the hello/hola screen?

Once an iPhone has deleted all personal information, does it go back to the hello/hola screen?

Yes. You will need to go through that setup process again.

If you're talking about "factory reset" the answer is yes. Just be aware it restores the phone to the condition it was in when you got it. It's not just personal details - it's apps, photos, music, everything.