No, Wisconsin has not "gradually" increased anything. They made a massive leap in offensive speed from last season to this season. Nobody shaves 4 seconds per possession off their average season over season while keeping the same coach (and players). It's bizarre how big of a leap in pace they have taken, and this is unrelated to rules changes with shot clock that were in place prior to last season. Wisconsin ranked 346th nationally last season in offensive tempo, just barely ahead of the slowest teams in the country. They have jumped up roughly 200 spots in the rankings so far this year.
And yes, I am aware of the effects of a 30 second clock vs a 35 second clock and the benefits of a lazy press that wastes a few seconds. You are preaching to the choir. I've been harping on those things for decades. But the shot clock changes are minor and haven't really hurt or benefitted anybody except fans that get to see a few extra possessions per game.
And those extra possessions have led to more points. I'm not talking from year to year - I'm curious if Wisconsin keeps that pace all year or not tho, but while still playing slow, Wisconsin has been more willing to play fast since they shortened the clock. They don't like to, and it's not their first choice, but they aren't necessarily waiting until the last second to shoot like they were seemingly.