I totally agree with this guy, but who is he in the industry? Someone famous for something? Just curious.
This "guy" is a security professional; her linkedIn profile shows her working in serious security roles for over a decade.
This might be something more colloquial to Australians than [wherever you "guys" are posting from], but to me when I see someone referring to 'guys' (as in, "hey guys!", or, "you know, those guys") it isn't always gender specific. You can go up to a group of women and say "hi guys!".
I'm going to gloss over the part where OP then referred to the author as "he", but I just feel that the word "guy" is more and more moving away from meaning "men" and instead just "people".
I'll leave that two cent coin on the table for you guys
But in fact “guy” means “man or woman” the way “he” can mean “man or woman” or how someone will say “ethnic” to mean “non-white. It doesn’t mean the sayer is a sexis/racist/jerk/etc, but it does subtly and casually reinforce a way of looking at the world. So worth correcting without making a huge thing of it.
And yes I’m an Aussie (...and as I was continually reminded as a kid, and sometime still am, I’m a wog too)