How dare you suggest that glorious Blue Jays provider Sportsnet would push a false narrative upon us! Sacrilege I say!
This is pulled from the Athletic: https://theathletic.com/1482337/2019/12/25/1-on-1-cavan-biggio-on-his-holiday-traditions-musicals-finding-a-positional-home-blue-jays-chances-in-2020/
Those were the highs, but there were a few lows too. At the plate, Biggio displayed remarkable patience and discipline that led to a team-leading .364 OBP, but he also went through streaky periods offensively and his batting average (.202) fell dangerously close to the Mendoza Line in July.
A more aggressive plate approach starting in mid-August helped him finish strong, as he posted a .987 OPS over his final 22 games. Heading into 2020, he hopes to build off that mentality to achieve greater consistency at the plate.
“When you really commit to it and commit to that aggressive mindset, it really helped me slow the game down more and not being able to miss my best pitch that I’m going to see in that specific at-bat,” Biggio explained. “That whole month of September, I committed to that game plan and that mindset and saw a lot of success from it. And I’m going to build off that going into next year.”
Cavan himself believes there was an alteration of approach so there may actually be something to this. It's certainly interesting the monthly discipline numbers don't show anything, perhaps he was more apt to swing at meatballs early in the count than was previously the case, that is one scenario that would help explain the increased success to end the season. Looking at Fangraphs shows that Cavan had a different batted ball distribution for the month of September, as there were more flyballs than previous months, less soft contact overall, and a more even distribution with more balls to center field and less of a pull centric approach, so it's entirely possible a new approach was indeed being instituted.