Is TKD effective in a “real fight”.

My 1st martial arts training was in TKD (almost 20 yrs ago) so I will always respect and admire that art for introducing me to “the way”. I’ve since trained Kenpo, boxing and Muay Thai. I was perussing a TKD book and found these techniques…can these seriously be executed in a real fight where the stakes are life and death ☠️ (I know I sound dramatic…hehh..heh).