If I ignore this, it’s not going to affect my account health because they’re saying there’s no impact on account health, right?
You can do flat file upload for COO.
There is no other way other than manually going into listing and updating the country or origin.
I suppose it is all about the country of origin, responsible person, etc. Best is to inform about all these in the EU as it is a very regulated market.
If no impact, it is ok. You might not be able to sell the products though.