He didn't restrict himself intentionally. I don't think that was what the poster meant. Rather, the poster probably meant that Sridhar was forced into this rest

He didn't restrict himself intentionally. I don't think that was what the poster meant. Rather, the poster probably meant that Sridhar was forced into this restriction by not being very attractive to those in the top 20%: "Our company in India always faced trouble recruiting, because most college graduates, particularly from well-known colleges, would prefer big-brand-name firms. Simply out of SHEER NECESSITY, we started to disregard the kind of college a person graduated from, and the grades they obtained."