This is wildly misleading advice. Using materials with comprehension below 80% is a massive waste of time.
Will you learn something? Yes probably, but will it be time and effort efficient? Not even slightly!
At 80-95% it can be productive if you're putting forth a lot of effort, but comprehensible input assumes comprehension above 95% for passive learning of materials.
To demonstrate what different (reading in this case) comprehension levels will get you take a look at this[1].
Agreed, but this is only a problem is you are biting more than you can chew. You can either learn the unfamiliar words to increase the comprehension rate, or find a material that is more suitable to your comprehension level. Comprehensible input is for reinforcing and contextualizing the previously learned words.
Will you learn something? Yes probably, but will it be time and effort efficient? Not even slightly!
At 80-95% it can be productive if you're putting forth a lot of effort, but comprehensible input assumes comprehension above 95% for passive learning of materials.
To demonstrate what different (reading in this case) comprehension levels will get you take a look at this[1].
[1] https://www.sinosplice.com/life/archives/2016/08/25/what-80-...