It's also simply not representative of what's being discussed. Support for FOSS is a many billion dollar industry, and describing it as happening in dorm rooms is absurd.
I understand that. The statement was intentionally an example of an outlier, not making a generalization as you accuse.
There is, in fact, at least one person in a dorm room writing FOSS. (I've been one, myself) And there's at least one person in an accounting office who does not write software. These are examples of two individual people who have different needs. This is not a generalization of any industry as a whole.
You haven't given a stronger plausible interpretation than spreading FUD. Your only defense so far is that it was a non-representative fact bordering on a non-sequitur.