Logically, if Bournemouth were indeed stronger than Liverpool, bookmakers wouldn't be offering higher odds for Bournemouth. We all know Liverpool is a strong team with a better squad. Meanwhile, Bournemouth is a mediocre team that will never be able to beat Liverpool.
I have a feeling that Liverpool is not going to win with a big goal margin? The total goal for this game may even be lower than 4 goals but Liverpool stands a better chance at winning than Bournemouth. If both teams were to be compared, Liverpool is way ahead of them with a very better form, team depth, consistency and strength except Bournemouth gets lucky a goal may may not be awarded to them by the end of this game.
We can really say with all certainty that Liverpool is going to win this match because at times football is really funny, the team you least expect to win may end up winning. Just like what you said Liverpool is way ahead of them with a good form infact they have all what it takes to win Bournemouth. However there are times the teams that are not in good form may just get lucky and win . I believe the season is just starting to underate the performance of any club, regardless of the club performance last season. Because clubs that there performance wasn't that good in the previous season may end up being in good form the coming or next season.