RMS characterization of it is a fabrication. Gates did not make the comparison that RMS says he did.
RMS could have accurately described the characterization Gates made, and then launched into how that related to the criticism RMS would like to have made, but choose instead to be dishonest to get a little more rhetorical impact with audiences unfamiliar with the truth (or already committed blindly to the cause) at the expense of his credibility with others.
I disagree with your charge of dishonesty. Gates said that cheap copies of Windows would ensure that many people in China get "sort of addicted" to Microsoft technology. Stallman's "characterization" of the comparison says that Gates likened Windows to an addictive drug. That is not incorrect. Your claim that he is fabricating is itself a rhetorical point intended to discredit Stallman as a liar.
RMS could have accurately described the characterization Gates made, and then launched into how that related to the criticism RMS would like to have made, but choose instead to be dishonest to get a little more rhetorical impact with audiences unfamiliar with the truth (or already committed blindly to the cause) at the expense of his credibility with others.