I think that when he has it here he will realise the problem he will have getting value with a normal betsize and he will consider other options like shoving. Contrarily when he is bluffing he will be perfectly happy with a normal betsize and will do that. I think any more levels than that or to expect him to be balancing in this spot is doubtful. Then again I don't play 5k so maybe I'm underestimating.

So fold.