Well, it's no surprise that this user became a winner, as he had 17% of the total number of gold tickets. Honestly, it's crazy that one user had more than 266k tickets because it also means that this user probably wagered about 1331 BTC to get that many tickets, or he just bought them for ~66 BTC. In that case, winning 7.44 BTC in the Lambo lottery is just a consolation prize for that user.
It's another time when Lambo has been won by one of whales of Freebitco.in. It's nothing surprising, considering how big % share from total tickets he had. It's very unlikely that he bought so many tickets or in other words spent 66 BTC to win 7.44 BTC. So yeah, as you counted, he simply wagered crazy amount of BTC and got tickets in this way.
I don't have access to stats, but it's interesting in these 9 rounds so far, how many times Lambo winner was whale and how many regular user with normal number of tickets.
He or she wagered 553.58634500 bitcoin during contest round 58 (April) and 12.09879000 bitcoin during contest round 59 (May). This accounts for a total of 565.685135 wagered, which corresponds to 113,117 golden tickets.
Where the other 153,145 golden tickets came from is a bit of a mystery, as they did not place in the top 10 during any of the other monthly contests. They either bought them, which makes no sense (why would you pay millions of dollars to win $200K?) or won them on the wheel of fortune, which seems highly unlikely (you would need millions of WOF spins to win that many tickets).