In this support article:
The answer to Q7 says:
Hyper-V Dynamic Memory is fully supported with SQL Server. Only SQL Server versions and editions that support Hot Add Memory (Enterprise and Datacenter) can see memory that is added by using Hyper-V Dynamic Memory. SQL Server 2012 Standard edition also recognizes Hot Add memory when running in a virtual environment.
The two sentences seem contradictory. Can anyone confirm if SQL Server Standard supports hot add memory when running on a Hyper-V guest?