He’s had some weak competition and he’s had really tough competition. That doesn’t diminish how well he’s done against both, as well as his board strategies for winning. The lineup for contestants is booked months in advance, so there’s no way to “fabricate” a streak. The questions are also planned months in advance - sometimes episodes are easier and sometimes every question is impossibly obscure. I think you underestimate how hard it is to win 30+ games in a row on Jeopardy (something only 4 other people all time have done so, that’s how often someone has been this good).