You are technically correct but unfortunately it's a lot of headache for property transactions etc if you do not have aadhar .

Non residents with Indian passport have been able to apply for an aadhar for the last few years while they are visiting India. But foriegn citizens with even OCI have been left out .

I assume that you may be having a PAN number? Was your pan issued with an Indian address or an overseas address

If it was issued with an Indian address ( very common for most people of Indian origin or Indian roots ) they have been deactivating the PAN unless its was linked to an aadhar

So it's worth checking if your PAN is active if thats the case ..

This has been happening to people who have been filing non resident Indian tax returns for many years with an overseas address linked to the IT department.

So they don't even look at their own data!!!

This happend in July to many people I know