Google Operations Program Manager interview questions

Had a referral through a current employee and was passed around through recruiters initially. Had a phone call with the recruiter for the role and then was scheduled a generic phone interview with a random interviewer with no clue on the role I was interviewing for. The interviewer assumed it was a TPM role while it was in Operations actually and started asking random hypothetical questions which were not really connected to the role.

I was contacted by a Google recruiter regarding the OPM position & had a brief phone interview with him. The recruiter mentioned that hiring manager is interested, and would like to set up a 45 minutes phone screen; however, in his Email, the recruiter only included the hiring manger's First Name, no Last Name and no Title. When I asked for additional details, he said that it's company policy not disclose any other information, and I can ask the hiring manager when I talk to him. Although the interview was not difficult, but due to the lack of information, this is a red-flag from the start....do I really want to work for a company that would not be willing to share critical information? Google should really look into improving this interviewing process to show some respect to their candidates & provide the necessary details.