DEI simply posits "there are probably some women just as qualified (or more!) as some of the men you already hire, so be open to it and perhaps encourage their consideration". Very few organizations manage to hire the absolute best person on the planet for a particular role and over-estimate the extent to which their interview process manages to successfully filter for it.
There are absolutely differences between men and women, but there's a lot of overlap. The absolute six-sigma ends of the bell curves likely matter if you're, say, at the Olympics, but my local fire department has visibly overweight men in their 60s on staff.
And that's fine! But it probably tells you that quite a few women (like the one in your video) are also capable of doing what they do - of which a significant portion is not carrying unconscious people out of burning houses.
(I've selected male/female simply as an example here. There'll be different excuses offered for not hiring black firefighters or gay firefighters in reasonable proportions.)
However, this is not what DEI is about. DEI is about seeing that 5% as a too small number, and trying to increase the number by lowering standards for women. Letting everyone apply is enough.
On average? Maybe! The woman in that video looks like she could severely kick my ass; I strongly suspect she could carry me. (I also suspect there are multiple roles in a fire call, and "carry big man" may be balanced by "squeeze into tight spot" tasks at times.)
If you can't hear the joking tone in that statement in the video, I'm not sure how to help you. "You're in a fire, I'm helping you, don't look a gift horse in the mouth."