Personally, I dislike the term "strong women," for the same reason I dislike the term, "strong men." Much better to have believable men, and believable women. A "strong" character just seems like a code word for "flawless", which is just another way of saying "one-dimensional" to me.
I had always understood the term "strong woman" to mean proactive in terms of the character, and nuanced in terms of how they are written. I have never gotten the idea that it means "flawless".
"Strong", flawed women do very well in TV and film (
Jessica Jones), leading me to believe that the problem isn't the existence of flawed, strong women - but the ability to properly write them as well as actors can portray them. And when a writer is struggling to write such a character, maybe studying a well portrayed one from film could provide some insight into what is missing in the description, because I doubt it is not what is on the page that is the problem as much as what has been left out.
And, let's be honest about this, if someone tries really hard to get you on diversity, they will. It's the nature of the game.
Well, there is a defense against this that is available to SFF writers: Do not make your characters fit current definitions of race, gender or sexuality. OR, don't define those character traits. Thinking about something like Alastair Reynolds
Revelation Space books, most characters do not have defining sexual relationships and I don't recall any important descriptions of race. A female Russian speaking character can just easily be Turkic or Mongolian as Russian, and she doesn't have a sexuality if she doesn't do anything sexual.
Literature can choose to flesh out a character any way the writer pleases - history, abilities, physical size/capability/presence, attractiveness, humor, peccadilloes, etc. You don't need to say "Bill is a white dude that likes chicks" if it isn't central to the story. Bill's role in a fantastic voyage can be independent of his skin color or sexuality, and maybe writers would do well to take greater advantage of this natural ability of the written word to be ambiguous about some things.