3bp SB vs BTN

Im a beginner in GTO world. I have a question about this sim. To determine our strategy, our first step is to read the board. On T52r BTN has all sets in range. So my overpairs are decreasing in value. I was thinking we will have a decent check back range here. But in reality solver is only checking 3% of the time, and uses a lot of medium/large bets. Is this because besides BTN has nut advantage, the board is not connected enough for him to find enough raises? So we can put pressure because we still have a 55% equity advantage on the flop? Its confusing me a little bit, because i was thinking if we use big bets we also want to have a check range.