Travel on irish passport

[Ifionlyknewthenwhatiknownow3]

Hi, I hope I can make myself clear!
If you fly from Belfast to an EU country (Holland) on an Irish Passport are you still affected by their non EU travel restrictions (covid rules) as you have arrived from Belfast or does the Irish passport exempt you from complying?
On the other hand if you were to fly from Dublin with a British Passport are you exempt because you've flown from within the EU?
Is it the Passport you hold or where the flight originated that determines things? The Dutch Government site refer to where a person lives, how would they find out where you live?
Hope this makes sense!

Things might have changed since we did this at Halloween but from memory our covid status was checked when checking in in Belfast to make sure it complied with Netherlands rules and again on departure and on arrival back in Belfast. We were all travelling on irish passports but were checked on non eu rules. Not sure if that's changed now though.

Travelled to Spain from Belfast on Irish passports at Easter. Treated as non-EU for the covid rules. Had to present the NIDirect generated certificates, but all very quick and efficient.

I believe it's your country of origin that's the factor.