Usually, the positive interview outcome with Google is good for a certain amount of time (like 6 months to a year?), so if another team does have an opening, you wouldn't have to do the entire interview process again within that timeline. That's what your recruiter likely means by applying for other roles and joining that group. They also usually keep the info in your candidate profile, so any hiring teams down the road will see that you had passed a previous interview, so that may increase your chances of being seen in the future. I know it doesn't seem like good news, considering you didn't actually get the job, but I would still consider it positively.