Cruise "Technical" Phone Interview for Sr. PM Role

Hi Friends, Looking for some guidance for folks that have interviewed at Cruise Automation. I have "technical" phone interview with a senior PM at Cruise in a few weeks. Couldn't find much info on glassdoor, but can anyone here kindly share their experience? Was the focus more centered on system design, architecture, or algorithms? (Still waiting to here back from the recruiter). BTW: As far as the interview process, seems odd that Cruise would be hosting a technical round after only an initial phone screen. I would expect this to be in person or at least after some basic behavioral questions. Maybe its just me... Thanks all!