After reading the question, I searched for this person and visited his LinkedIn account, which narrates the whole story.
It is a misconception that Google doesn't hire graduates from Tier-3 colleges. Well, this person is not just a graduate as he has 4 years of experience in the software field.
You cannot define success by the college you studied in. If you are hardworking and have potential, success will come automatically. There are various examples of successful people from not-so-famous colleges. Not every IAS is a B.Tech, not every scientist in ISRO, DRDO, etc. is from Tier-1 college.
Having a degree from a Tier-1 college does not automatically grant you success. Even a gold medalist has to earn by working.
Many people are not fortunate to study in a prestigious college or university. It does not make them less successful.