They recommend moving to a third European country for at least a year
I don't know about this part.
If I recall, there is no, and can be no, set time requirement. A three month period, I think, is seen as a sort of minimum....because EU rulings/regs/case law/something loosely defines (?) anything below three months as not being permanent.
The point...as KF states....is that you are really living there full time. So home ownership, say in New York, where you pop back over and have a car in the drive, while living in a hostel in Ireland....would indicate that you aren't really living in Ireland.
Likewise, if you spent say nine months in France, and couldn't converse on any level in French....this would indicate that you were not really becoming part of the community. If after that 9 months, however, you could show that you had joined a conversational French group that met in the local Library....
But as far as a twelve month requirement, I am almost certain that there is no way that that could be effectuated officially. And I would also think that such a requirement would be difficult to apply "off the record".
But again, as with all these things, certainly you want to work within the system; a protracted fight is not what you are after.