These were companies that chose to attend aaa event on getting women in tech. You really think they are discriminating against women? Did they not show up there specifically to recruit women?
In any case, it is ridiculous to blame men for the crime of job hunting. The fact is there are fewer women in STEM because fewer women go into STEM. I am an engineer. When I graduated, 16 men and 2 women joined me in getting a BSCE. This isn’t an isolated experience. Note this quote:
When considering university and VET together, in 2018 women comprised only 21% of total STEM course enrolments and 23% of total STEM course completions. In comparison, women comprised 60% of total non-STEM course enrolments and 61% of total non-STEM course completions in 2018.