70 is very optimistic, but the numbers he's put up support it.
Lowetide did a piece in the Athletic that projected Bouchard at 57 points... not that far off:
Now that Bouchard is a power play staple for the Oilers, how how can he fly next season?
theathletic.com
Having said that, he could put up 55 points and still not be worth a $7M contract and I know there are plenty of pro-Bouchard Oiler fans who feel the same way. This kid has all of the poise and skill to kill it on our power play (his first opportunity to do so is this year)... but he's still got warts defensively that need work. Thankfully we have a great mentor in Ekholm.
So projecting Bouchard to hit 70 points isn't quite as homeristic as it seems. His offensive chops aren't really in question and he's inheriting the greatest power play in history (on which his performance actually moved the needle even further in the positive direction).