I see that the Archdiocese of Los Angeles had a mass 'in honor' of the late President Reagan! I hope that this is some kind of infelicity of wording on behalf of a careless journalist.
Putting aside the fittingness or otherwise of holding a Requiem Mass for a deceased non-Catholic, I hardly think the service as described sounds very fitting. It almost sounds as though he has been canonized! It's no wonder that so many Catholics are confused as to the 'last things'.
It is a holy and a holy thing to pray for the dead.