Over one game yes, over a season in this day and age, not so much.
But it's OK, we don't have to agree, and I am not saying there was a great conspiracy, I am just saying an outlier like that in many other sports could be investigated.
A lot of stars aligned the season that Leicester won -
Every one of the usual title contenders had very poor seasons at the same time.
They'd picked up Mahrez and Kante for a pittance - an absolute coup in terms of transfers, and both now, deservedly, have multiple title wins.
Vardy is a great player who peaked at exactly the right time.
They played very few games that season - ten less than most of their rivals. After October 2015, they had just two non Premier League games all season. If you look at the squad stats, they didn't play that many minutes, and played virtually the same team each week. For comparison, Rodri has already played more minutes this season, than all but one Leicester player in the entirety of that year.
Tactically they hit a bit of a sweet spot in Premier League terms - where the bus parking/counter attacking model was benefiting the smaller teams. The bigger clubs hadn't as much experience of playing against total defence every week, while the money in the game meant that most clubs could afford to bring in great attackers who were capable of breakaway goals. Leicester lucked out with Vardy and Mahrez that season, who could win games while their team mates could sit back.
I also wouldn't rule out a few favourable decisions (more likely unconscious bias, rather than deliberate). Everyone wanted them to win, and they were much less likely to come up against a ref who had any grudge, or who'd had a run in with their manager in the past.
They'd also broken FFP in the Championship to move up into the PL, and were one of the higher spenders amongst the "rest of the PL".
The extra money from the PL win/CL entry obviously helped them for a couple of years too. If you look at the Deloitte money league, they reached as high as 14th based on their 2016/17 accounts - with £271m a year - way ahead of anyone else outside the big six, so it's not a surprise they continued to be successful for a while. In comparison Spurs had revenue of £359m that year, which isn't a huge gulf. The latest accounts tell a different story and have Spurs on £523m, while Leicester are back down to £255m (Still rich in world football terms, but within a few seasons the potential to compete with the rich six has become much more difficult).
For me, they were just hit that sweet spot for one year, and it's no surprise couldn't keep it up, as financial realities caught up with them, and their best players passed their peak (Vardy, Schmeichel), or were sold (Kante, Mahrez).