That's exactly what I thought. Constructive criticism is saying "I think this food is a bit too salty/needs a bit more practice", being "brutally honest" is saying "I think this food tastes like [censored]/you're a rubbish cook" if you ask me.
My idea of "brutally honest" is just being completely honest.
"Babe, that was way too much salt." "Maybe you should ask your mom for her recipes." Etc.