What did you gather as 'needed ___domain' from that comment. 'needed ___domain' is often implicit, its not a blank slate. candidates assume all sorts of 'needed ___domain' even before the interview starts, if i am interviewing at bank I wouldn't suggest 'load it on your laptops' as my 'stack'.

OP even mentioned that it his favorite 'tricky question' . It would def trick me because they used the word 'stack' which has specific meaning in the industry. There are even websites dedicated to 'stack's https://stackshare.io/instacart/instacart