they still had to pay a higher fee than the 1 sat per vbyte they initially broadcast, so i don't get what the point of it is - the miners aren't doing you a favour, you have to pay them to do this, by whatever means.

1 sat tx getting confirmed in a high fee congestion period would stick out like a sore thumb too, so presumably they could be discounted/ignored by fee estimators ?

it's RBF with extra steps - just seems silly.