Those studies however generally put beef and sausages into the same "red meat" category. So yeah... that science is, from what I've seen, basically worthless.
there are literally thousands of studies. there's no real scientific debate amongst people that know what they are talking about. Red meat, and any food high in saturated fats, are awful for your heart. full stop. that includes sausage, steak, ham, butter, etc.
the people eating "lean steaks" are fooling themselves. There's no such thing as "clean beef" it all has high amounts of bad fats. Are some worse than others? of course but let's not kid ourselves.
Why would beef and sausages not be in the same category? A large percentage of sausage literally is beef.