EY Senior Associate interview questions

Phone interview process is very smooth and then invited for super day. The first technical interviewer came up with very detailed question about sth. I might have done 5 years ago and I didn't put anything in my resume that I did that kind of project. He just assumed that I should know that because I worked in the group. And it is just a senior associate position. Why did he expect I know sth. a manager or senior manager should know? Other interviewers are ok.