I don't know much about what she's saying nowadays, but IIRC Gail Simone was the one back in the day who came up with the term "Stuffed in the Fridge" (or at least brought more attention to it), referring to female "characters" who exist primarily so the writer can have them killed (sometimes brutally, the term refers to Green Lantern Kyle Rayner's wife's corpse being found in the fridge. Geezus, GL comics can get dark, but that was so "edgy" it just came off as immature), raped, badly beaten, de-powered, brainwashed, etc. to motivate the male character. To be clear, this refers to characters who were active during the characters' run and then "stuffed", so this isn't referring to "characters" like Thomas and Martha Wayne, Ben Parker, Frank Castle's family, etc.
Beyond the obvious sexism of the trope (yes, the reverse can happen, but it's far less common in comparison) she wasn't exactly wrong, and just the fact that it's about as generic a cliche as you can get in terms of motivating the main character. Seriously, comics should strive to have better plots than Generic Action Film #59,257. I'm not saying it's impossible to do right, but the problem is that these female characters seem to be viewed as to only exist for this to happen in the hands of the writers who do this. As opposed to say someone like Gwen Stacy who was a significant character in the Spider-man comics for a good while before finally dying.