Then why are we speculating about counter-factuals?
There are women in the Ruby community, and they are interesting speakers who have done interesting work. There's no need to ask folks to prevaricate about whether diversity or quality are at odds.
Yes, there are women in the Ruby community who fit that criteria. But the question isn't whether there are women, it's how many of them are there vs how many men are there with similar qualifications? If there are 100 men for every 10 women (which doesn't seem too far off based on my experience), then it isn't unrealistic to have a panel of 6 composed entirely of men with no gender discrimination taking place.
There are women in the Ruby community, and they are interesting speakers who have done interesting work. There's no need to ask folks to prevaricate about whether diversity or quality are at odds.