the IATA form is just a suggested form. Is the country you are looking to enter using this form?
You can get to the same form from the IATA page where it states "suggested" rather than the Robert Koch page you posted
https://www.iata.org/en/programs/saf.../locator-form/
Many countries have their own form and some of them are available to complete online.
UK and Ireland are on line, AFAIK the UK requires the form to be completed online.
Poland is not online, a form is distributed on the plane to be completed and returned to the crew. I am not sure about the land border