FFs keyboarddad what the hell would your partner think if she saw what you wrote?!
You sound like my ex (who seemed to think and actually said once that I was sat at home doing bugger all - despite a bf colicky 4 month old!)
Your posts are misogynistic, patronising mansplaining! AND you've clearly not read the ops posts because my and pp's understanding is she has ALREADY discussed this with her partner several times and nothing has change!
Op can correct me if I'm wrong but it sounds like her partner doesn't so much as clear up after making a snack!
As for why a sahm shouldn't do ALL the housework that's because she's also
'Working' through the night - feeds, nappy changes, colic, teething, colds n coughs, fevers (especially after vaccinations), bugs, nightmares, separation anxiety...
'Working' with the baby during the day - feeding (if ff that also includes washing and sterilising bottles and making up feeds), nappy changes, comforting, stimulating baby, plus again dealing with teething, clinginess etc (try doing ANY housework with a baby that gets so worked up if you put them down that they make themselves sick. If you have a colicky baby or one with reflux issues this cannot be risked at all).
Frankly I was doing well if baby was calm and well cared for, dishes done and maybe one load of washing on before ex was home, and that was after being up since 5am! (Dd an early riser).
I was knackered!
Seriously get a clue quick before this baby is born or you'll have a very pissed off mum on your hands! Plus as pp said a higher chance of pushing her into PND!