Spice -- Absolutes (and essential oils) are not hydrosols.
Absolutes are created by soaking plant material in solvents such as hexane and alcohol. The solvents dissolve some of the fragrant waxes and oils in the plant material. When the solvents are evaporated, the "absolute" is what is left behind. (There's more to the process, but this gives you the general idea).
When essential oils are made by steam distillation, water is boiled, making steam. This hot steam is made to flow through the plant material. This steam strips (removes) some of the fragrance chemicals from the plant material. When the steam is cooled, it turns back into liquid water and this condensed steam is carefully collected. There will be some oil that floats on top of this condensed steam. This oil is removed and bottled separately -- that is your essential oil. The scented water that is left behind after the EO is removed is the hydrosol.
Absolutes and EOs are the fragrant oils from plants. Hydrosols contain the watery fragrances from plants.