And yet, it seemed bad but the consensus in the mid 20th century was that cigarettes were good for you. You can watch Tour De France videos of bicyclists smoking while biking because it was supposed to provide energy.

And the fact that the dangers were known to some, but yet society widely considered tobacco safe and even good for you, does not help the idea that the dangers would be obvious. If we continue the analogy, it's very possible people 50 years from now will be pointing to this paper to show that the dangers of cellphone radiation was known in the early 2020s, even though society and the scientific community broadly haven't accepted these dangers.