That's an interesting way of framing it—I expect that no, he hasn't directly dissuaded more people than he's encouraged.
But I expect that the second- and third-degree network effects have. MIT has had a huge influence on open source software. Keeping the number of women who contribute to FOSS lower has a snowball effect of discouraging other women from contributing—there are fewer leaders to look up to, and day-to-day misogyny in FOSS spaces goes unchecked more often.
As another commenter pointed out, I also don't think net impact is the bar. But besides that, it's very hard to measure, so I prefer to focus on having positive impacts and limiting/fixing negative impacts. I think the things he said on the CSAIL mailing list continue to contribute to a negative environment for women at MIT.
But I expect that the second- and third-degree network effects have. MIT has had a huge influence on open source software. Keeping the number of women who contribute to FOSS lower has a snowball effect of discouraging other women from contributing—there are fewer leaders to look up to, and day-to-day misogyny in FOSS spaces goes unchecked more often.
As another commenter pointed out, I also don't think net impact is the bar. But besides that, it's very hard to measure, so I prefer to focus on having positive impacts and limiting/fixing negative impacts. I think the things he said on the CSAIL mailing list continue to contribute to a negative environment for women at MIT.