The heavy emphatic nūn is نَّ and adds strong assurance to the verbal meaning. The source gives separate active and passive columns.
Ordinary imperfectWith heavy emphasisMeaning
يَرْضَىلَيَرْضَيَنَّHe certainly will be pleased
تَرْضَىلَتَرْضَيَنَّShe/you certainly will be pleased
يُرْضَىلَيُرْضَيَنَّHe certainly will be approved of
The final alif of يَرْضَى does not simply remain unchanged under emphasis: the form reshapes and the emphatic nūn appears. Prefix vowels continue to distinguish voice.