This is a ridiculous situation and he is failing them massively in his attempt to get one over on you.
As someone else said, mine have been changing bed linen; able to use the washing maching; bake cakes; tidy up after themselves; sort breakfast for themselves etc since they were in infant school.
Now, the 13 year old cooks dinner twice a week (from scratch
) because she enjoys it.
He is massively disempowering them now, and for the future, as much as anything else, they will struggle to find someone who is willing to wait on them hand and foot when they reach adulthood.
Parenting is about teaching, facilitating and enabling your children to become competent, capable, independent, functioning members of society (as you obviously know!) - not treating them like babies forever.
My exh has a tendancy to do similar when our daughter is with him. Not for the same reasons yours does, but because he doesn't do the day to day parenting he's a bit out of touch with what she can do etc. She did push back against it a bit when she was about 12 because she found it infantilising.
I'd perhaps try explaining to the older one that your job, as a parents, is to teach them these things because one day they will live on their own and need to feed etc themselves. Whilst I wouldn't suggest you play him at his own game, it wouldn't hurt for them to hear the realities of expecting mummy to do everything for you.