The reporting regime would not cover employees. Your question is on point for that. If there were a reclassification of some of the gig economy workers to be employees, then they would be direct reporting by the employers' tax administration and they would fall out of this reporting regime.
The types of information that would be reported would be identifying information about the individual. It would also provide information on their jurisdiction of tax residence, how much consideration they received for each quarter of the year, the number of relevant activities they had undertaken, any fees or commissions that have been withheld or charged by the platform in their dealings with the platform seller. Additional information would be provided with respect to people renting properties, but I don't think that's relevant to your question.
There would be information about aggregate employment or aggregate income received, which could potentially be helpful in that respect, although not necessarily definitive.