Hi I am glad you find my post useful. I checked with the NOIA team about the list of countries.
Here is the list of countries excluded from NOIA Testnet node
Hi! Every country except Republic of China (excluding Hong Kong, Taiwan & Macau), Japan, Canada, Bosnia & Herzegovina, Ethiopia, Iraq, Sri Lanka, Syria, Trinidad & Tobago, Tunisia, Vanuatu, Yemen, Afghanistan, Burundi, Central African Republic, Democratic Republic of Congo, Eritrea, Republic of Guinea, Republic of Guinea Bissau, Libya, Myanmar, Somalia, South Sudan, Sudan.
Apart from this list everyone can join the NOIA Testnet node