Whether the Fins could dink and dunk, it was 21 all at that point. It just takes a couple of break out runs - which Achane is capable of, especially against a tired defense - to get them into that position.
I'm not saying the Bills offense is bad. That would be stupid. But I am concerned there seemed to be a lack of ability to change the course on that side of the ball until the RTK penalty (two three and outs followed by a "punt"). Even if the defense managed to hold, there was no proof the Bills offense could move the ball either. The RTK penalty swing confidence away from the Fins towards the Bills, which led to the win. Without it... who knows what would have happened. Maybe the D would have pulled out a safety or interception without losing yardage. But perhaps we would be sitting here 2-1, because the course of the game at the time of that punt was not looking good on either side of the ball.