Fatwa on infant from al-Khomayni

Salam alaikum, leader of Iranian revolution in his book “Tahrir al-wasela” said:

It is impermissible to have intercourse with ones wife before she reaches 9 years, without matter is that permanent or temporary marriage, and as for as all other enjoyments like touching with sexual desire, hugging and placing your private part in-between her thighs, then there is nothing wrong with that, even if it is done with an infant.