They've scheduled a telephonic round for assessing technical skills. The interviewers didn't have much knowledge on ML , asking very basic questions. But they aren't able to understand simple concepts such as model stacking etc. There are no follow up questions or counter questions. The only reply i got is OK. Seems like they are expecting textbook answers, if you explain the same concept with slightly different terminology. They don't get it. Neither they'll agree to your answer nor will tell you what's wrong. Better put someone who knows ML into panel next time. instead of wasting candidates time.