Generosity Affects Golems, and in reveserve [4068924613]

Lightning Golem gets affected by generosity, as it shows the G icon on the golem sprite.

When I checked for how much better, it actually reduced my cast speed, is there something wrong?

Lightning golem has a duration based aura.

The passive generic buffs (in gem descriptions, ie the increased attack and cast speed) granted by golems is not affected by generosity, is only affected by "effect of buffs" (chimonji) or "effect of buff granted by golem" from helmet enchantments and elementalist ascendency.