It's badly worded, the level you select can never be FL410. The 'at or' in "at or below FL410" isn't required.
This is what NAT doc 007 says
The general concept of these Oceanic in-flight contingency procedures is, whenever operationally feasible, to offset from the assigned route by 15 NM and climb or descend to a level which differs from those normally used by 500 ft if below FL410 or by 1000 ft if above FL410.