Interesting question. Key training drills (and there are at least 3 separate drills) focus on pressure and two way running. These became more apparent in the last 2 months of the season, specifically the 2 way running drills. There was one pressure drill that was run during pre-season and the early season and then dropped later in the year.
But to my view these drills in the last couple of months were more teaching drills. I got/get the impression that the coaching team knows they need a transition and need to teach the new gameplan (gameplan phases) in bits and almost more in prep for next year. (That's how it came across to me at least.)
Up until the last month there was a couple of tackling drills every main session. As
@caesar discussed with me, given the AFL/AFLPA position on head knocks heavy tackling/contact training is limited to (I believe) 20 minutes or so per week.
Interesting that a couple of players (notably Sam Banks) would do specific tackling drills once training had concluded. So it is a focus at least for some.