Should my friend do this ?

My friend who has less than a year of experience, has been searching for jobs for almost a year now. And the market has been, as from my observation, favorable to those with atleast 1.5 YoE. So, he's only got 1-2 interview opportunities till now.

Today, idk what amazing luck shined on him, he got an opportunity to interview at a pretty good company. But since he's kinda nervous about loosing this opportunity if they are expecting more for a junior role, he's thinking of approaching the interviewer on LinkedIn or somewhere and request them to not got hard and keep it simple as he's really in need of this job to take care of his financial crisis as the only breadwinner in the family.

But I felt that it might backfire if the interviewer fails to understand and goes chaos. He's asking me whether to do it or not. I don't really have any experience in this. So, I'm asking you all amazing folks here. What should he do ?