Has the label incel now evolved to the point it includes people in a relationship?

I recently came across a video that claimed only 7-15 attacks worldwide, were attributed to incels. I looked it up and was able to find 23 known incel attacks in 17 years, over 50 people killed, over 80 people injured. Even if you think there were only a million incels within that 17yrs period, 23 is not even up to 0.0001% of that generous lowball. Meanwhile statistics show that, on average, over a 100 women are killed by an intimate partner, every single day. I just came across another 'incels kill women' type comment and it made me want to find out. How did this narrative become so common if no one really considers people in relationships as incels? Where are the incels killing women? Or is this narrarive because it's meaning has expanded to include people in relationships?