Goswami doesn’t express an opinion. She says most earn less than $20,000, but that doesn’t allow us to infer what she believes about the average salary of Ergon Foods workers. The average could be higher than $29,000 or lower, even if most earn less than $20,000.

Neither expresses an opinion about this. Although you might think the workers are striking over pay, neither speaker describes the cause of the strike.

Not a point of disagreement. Nordecki believes the Ergon workers are not underpaid. But we don’t know whether he would support their strike if they were underpaid. You might think he implicitly supports strikes from underpaid workers, in which case he agrees with Goswami.

This is a point of disagreement. Goswami believes they are underpaid. We can infer that Nordecki does not, because he says that he disagrees with the strike if pay is the issue underlying the strike.

Nordecki doesn’t express an opinion. He disagrees with the strike if it is based on pay. But it might be based on a different reason, in which case we don’t know whether Nordecki might support the strike.