RAM
RAM
It seems the statement refers to available memory rather than RAM usage. If it varies with running processes, it's typical.
It specifically mentions RAM that can be utilized by applications, not just any free memory. Windows will indicate the same available space regardless of program usage (use Task Manager for confirmation). The portion not reserved remains accessible. For instance, if an integrated graphics card is set to reserve 1 GB, your effective RAM drops from 16 GB to 15 GB.