Why is the first «هُ» in «وَاسْتَغْفِرْهُ إِنَّهُ» not ṣilah kubrā?

Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf

• Because no hamzah follows
• Because it is not a pronominal hāʾ
• Because every hāʾ is two counts
• It is preceded by a sākin rāʾ, not between two moving letters