Guaranteed? from that reading it only shows how confident this bettor is. That won't give an easy pass to win because even in the lowest odd, there's no guarantee with that because the risk remains with that. There are still a lot of bettors that would definitely bet on low odds as 1.01 even with a million dollars but that's not a safe and guarantee bet. We all know about that and if someone who's too attracted to bet on these odds need to think a lot first.
There are lots of manipulation in gambling and trying to make profits after you have stake huge amounts on a match will not change the outcome. Most of the big games are manipulated and trying to win can look uneasy because the people that the fixed the match also want to make big money from gambling.
The problem in being too confident about a game either through the source or by the looks of the odd size, is that, you can go all in without even thinking that you're taking a very wayward stupid risk that without any glimpse of reasoning behind it except that you're just confident it would play, and for that, you must have to take huge advantage of the opportunity to win something big from it while you can.