The complaint seems confused
The tool is being criticised for being rubbish at accurately identifying gender. This may well be true but does it predict better than random? This might have value to advertisers. It would presumably be capable of improvement but can never be 100%.
The second criticism is that it dares to ignore the current agenda that gender doesn't exist and is a purely social construct. Advertisers don't care, they want to sell to anybody with money and if the tool could identify the individual's personal opinions and self-image they'd be willing to pay for that.