Speculation surrounds ACE inhibitors (ACEI), which are a type of high blood pressure medication, in that they may dampen your immune response to viruses over long time usage. The other speculation is that circulating amounts of ACE2 are increased by ACEI and SARS-Cov-2 specifically binds to ACE2. The confounding aspects are as you suggest that the overall health including kidney health are often poorer in people with hypertension.