The statute that governs condo liens is in 356-B:46. In rereading the statute, it seems to me that the legislature was not really concerned with notice to the unit owner, most likely because the unit owner should pretty well know if they are paying the bill or not.
The statute does give the association additional rights if it does send notices and my guess is that most attorneys will send the 70 day notice to the unit owner and the first mortgage lender in order to give the lien priority over the first mortgage.
A notice to the unit owner also entitles the condo association to cut off services to the delinquent owner, so there are multiple reasons to give notice to the unit owner. I did not, however, see anything in the statute that said that a notice must be given to record a lien.
I cannot comment on the policy as I cannot tell from the question if the policy is a binding policy or simply a guideline.
My answers are general in nature based upon very short, and often incomplete questions. Please do not rely upon my answers. If you need a legal opinion, you need to hire a lawyer who will take the time to fully understand your problem and then take the time to research the issues.