"ASIC resistance" is a silly false premise  I don't know where you got that info from but its total bullshit.

They are not ASIC resistant, they are DESIGNED for ASICs from the beginning.

It just happens that this ASIC is good ol' DDR. Why? Its a well established and widely available technology which helps with decentralization.  Also there won't be a sudden and huge shift in hardware because the cutting edge hardware for these algorithms is already available to everyone and will continue to be so, simple.