In 2018-19, 90 points took the second western wild card spot, and 93 points took the third Pacific divisional spot.
83 points with 11 games to go, the Oilers had to play at 0.318 (7 of 22 points) to get to the 90 point threshold, and 0.455 to get to the Pacific threshold from the prior year. If you wanted to buffer in some variance and look at the previous year, you'd need 98 and 95 - which would be points percentages of 0.682 and 0.545. Considering that the Oilers were 0.585 over 71 games in 2019, I think it's fairly likely we would hit 94 points, and extremely likely to hit 90.
I think you're underestimating how big of a difference 4 points is in the current NHL, with 11 games left. The absolute worst team in the league (Detroit) played at 0.275 P% over the year, the next lowest was 0.437, and then 0.450. The 5 games before the break, the Oilers secured 5 of the 10 points available (0.500). I don't really see how the Oilers would have suddenly started playing well below the second and third worst teams in the league at 0.318 P% over the final stretch. Given how many divisional games there are near the end of the season, I'm not even sure two of the four teams would be able to pass them, since they all take points from each other. Is it possible we just blow all of our divisional games? Sure, but I wouldn't really bank on it. 0.585 p% = 96 points, which was enough for a playoff berth in each of the last 5 seasons, so I think if they did stay at exactly the same level this year, it's reasonable to say their chances would be good.