How does it know my country's rules?
The assistant is told where your business is taxed. For a Cyprus business it uses the same VAT 4 box mapping as the VAT 4 report in your books, so both put the same sale in the same box.
Does it file anything?
No. The assistant can prepare drafts and suggestions, but posting, paying, sending and deleting are always a person's action. Deline's reports say plainly that Deline does not provide tax or legal advice.
What should I do with its answer?
Use it to understand your options and prepare your work. For decisions about your own taxes, confirm with your accountant. You can invite your accountant to the business with the Accountant role.
Explanation written from the Deline app's own screens and texts (build eba146497 (Deline cf723fe1f)); it has no steps to check.