Please tell me how Placements "accurately" decide where I should be?

Ok. So I just started my placements. I made sure to wait and have at least 3 top laners, 3 mids, 3 junglers, 3 supports, 3 ADC's, and 2 carries. So I think I'm doing fairly well as a member of my team, but the people in the placement's, they......... don't know what theyre doing tbh. One said they only played mid and only had 13 mid's. One said adc or feed (He fed anyway), one first picked Sona, and the other decided to go 1/7 before dodging the match. Heres a screenshot: Tell me how this will accurately place me.
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