Sounds cool but him folding 100% of his top pairs its kinda unrealistic so if we are trying to make him fold top pair in 3betpot then he should also vbet this river with 55+ and those busted draw bluffs too imo.
Board: 3

4

2

K

8
*******Equity*****Win*****Tie
SB*****44.49%**44.12%***0.37%*{ QQ }
BB*****55.51%**55.15%***0.37%*{ 22+, AKs, K2s+, Q5s, 85s, 75s, 54s, AKo, KJo+, 75o }
I stove it for him folding anything but tp+. Although you may argue that 22-77 may not be in his range, i say given that ive just stacked him he might 3bet those too.
Anyway, if we shove he must fold 47% of his range (we bet ~280 into 315) but his tp+ makes 60% of his betting range. So its -EV
If he folds 50%+ of his top pairs then its +EV:
Board: 3

4

2

*K

*8
*******Equity*****Win*****Tie
SB*****56.86%**56.54%***0.33%*{ AA, QQ }
BB*****43.14%**42.81%***0.33%*{ 22+, AKs, K2s+, Q5s, 85s, 75s, 65s, 54s, AKo, KJo+, 75o, 65o }
Im kinda tired atm and possibly f* up the math/ranges. Feel free to correct me.