The scam isn't just the medical certificate, it's the whole thing - to get a license, you need to attend the DLT in person to undertake testing and have your picture taken. And a medical certificate (which is required) is only legally issued when you see a doctor in person.
you pay tax where you live - simple as that. And if you live in Thailand over 180 days, you're a tax resident of Thailand. Instead of contacting the ATO, try contacting the Thai Revenue Department and ask them. And if you're bringing money into the Kingdom not declaring tax in Thailand, they are talking about targeting foreigners who dont.
Not true - I'm Australian but Im not a tax resident of Aus and pay income tax in Thailand and have done so for years. And I should add, not having to ever deal with the ATO ever again is a blessing.