yes i think this answers my question. In quantum erasure and delayed erasure experiments
I conclude that erasure of which way information - either before or after negotiating
2 slits- restores interference.
It does not matter whether erasure happens first or interference happens first...
When which way information is erased, interference reappears. Is there any theoretical
and experimentally confirmed evidence that the interval between pair creation and erasure
has any effect? The experiments I've read seem more concerned with evidencing the
erasure and delayed erasure result...