Thanks for point it out.
Yes, the last sentence in this chapter is repeated. Actually, we want to indicate when open drain is selected, then external pull up / pull down register is mandatory. For push-pull there is no such requirement.
We recommend not to connect the INT pin when it is not used because we want to avoid the use to configure the INT pin status wrongly. It will cause the current leakage or affect the correct behavior of interrupt in system level.