A lot of questions the article raises about Venus are tentatively answered in this ESA article: "Since Venus has no intrinsic magnetic field to act as a shield

A lot of questions the article raises about Venus are tentatively answered in this ESA article: "Since Venus has no intrinsic magnetic field to act as a shield against incoming charged particles, the solar wind sometimes interacts directly with the upper atmosphere. However, Venus is partially protected by an induced magnetic field." https://sci.esa.int/web/venus-express/-/50246-a-magnetic-surprise-for-venus-express https://sci.esa.int/web/venus-express/-/50246-a-magnetic-sur...