You only get golden tickets by (a) wagering, (b) buying them, or (c) winning them on the wheel of fortune. So they either wagered a lot, bought a lot, or won a lot on the wheel, or some combination of the three.

In the other 4 monthly contests, they would only be able to wager ~10 bitcoin without showing up on the leaderboard. So, it is possible they wagered 40 extra bitcoin during the other 4 months of this lambo drawing. But that would only be 16,000 golden tickets.

Given that you have ~0.1% chance of winning a golden ticket on a single WOF spin, you would need millions of spins to win that many golden tickets. It is not possible to get that many WOF spins in 6 months.

Buying 100k golden tickets would cost 25 bitcoin. Nobody is crazy enough to do that.

So the short answer to your question is: I'm stumped.