It seems that JS MVC frameworks change every year, maybe they decided that asking questions on the flavour-of-the-month is not an indicator? Would expect some JS questions though.
As a bonus, finally got to talk to the hiring manager a second ago and he informed me that there would be NO javascript or front end development in this role, just converting Crystal Reports into some other obscure reporting system. So I ended the call promptly with a "Thank you for your time and good bye"