"So Venus has become a more attractive astrobiological target in recent years, just as the search for alien life has increasingly moved from the scientific fringes into the mainstream."
As the article reports, statements like this quote from the report suggest what is the primary reason for going back to Venus. Looking for life
Charles Darwin published his view on the origin of life (abiogenesis).
"Though no evidence worth anything has as yet, in my opinion, been advanced in favor of a living being being developed from inorganic matter, yet I cannot avoid believing the possibility of this will be proved some day in accordance with the law of continuity.1", Charles Darwin, 1. “To Daniel Mackintosh 28 February 1882,” Darwin Correspondence Project, letter 13711,
http://www.darwinproject.ac.uk/entry-13711.
Abiogenesis must be validated for astrobiology as a science. Venus and Mars are in the focus to find life there. Other exoplanets at the moment remain much more difficult to verify life on them compared to Venus or Mars in our solar system.