Hello all,

I’m seeking some clarification for the following argument that is given as an example of a “Belief vs Facts” flaw in the Core Curriculum.

Admin edit: Removed. Please link to the argument and do not post things directly from the course.

My breakdown of the argument is as follows:

A (FRB) is a (X)

Dr. L knows that her colleague’s lab detected a (FRB) earlier this year

Therefore, Dr. L knows that her colleagues lab detected an (X)

The curriculum says the conclusion does not follow because it’s not clear that Dr. L knows what (X) is, except that her colleague’s lab detected one. So my question is would the conclusion follow if it instead said “Therefore, Dr. L knows that her colleague’s lab detected a (FRB)”, rather than an (X) that was erroneously concluded? I’m just a little tripped up because the argument is concluding that Dr. L knows that her colleague’s lab detected something (X), which follows from the premise that Dr. L knows that her colleagues lab detected an (FRB), which is an (X). I feel as though my lack of understanding for this flaw is exploited time and time again on LR questions so any additional insight is appreciated. Thanks!