Yeah, it's the same thing at very different time scales.
In other words, the standard deviation for 3-year returns is much lower than the daily standard deviation.
You can get a positive return in 3 years without being especially good or lucky. But getting a positive return every single day for 3 months is extremely unlikely.
So maybe GS realizes some loss every day, but surely they hold some positions on longer time frames. They don't wipe the slate after every day.