Offensive bonus point for scoring 3 or more tries than the opposition.
This is correct. The Top 14 system is better than the bonus point system used in Super Rugby in my opinion because it has a dividend for defence.
In Super Rugby, Team A can get five table points for scoring six tries (for example) and winning. The side they beat, Team B, can gain two table points for scoring four tries and losing by seven points or fewer.
In this scenario in the Top 14 (or Pro D2) Team A would get just four table points for winning. The losers would get nothing. There are no points for losing by seven of fewer.
In order to win a Bonus Point, Team A (who scored six tries) has to limit team B to three tries (i.e. three fewer than them).
Every now and then you see a Top 14 team which has a big lead pissing themselves because their opponents have scored another try and they have lost that three-try differential for the match.
So you may see a team that is 25 points ahead with ten minutes to go throwing everything at the other team to get another try to re-establish the three try differential.
Most of the time though you see teams working hard during the game to stop the tries so the differential problem doesn't happen.
You can see the point of the four-try bonus points because it encourages teams to keep attempting to score tries even though the game is lost.
But there is nothing more horrible than some of the games the Chiefs have played in the RSA over recent years where teams had eight tries (or so) scored against them yet still got a bonus point—or even two.