金剛經纂要刊定記 4.23

4.23

鬼通胎化者。次寬也。謂：地行羅剎及鬼子母皆是胎生。故有鬼母白目連曰：「我晝夜分各生五百子，隨生自食，雖盡不飽。」故知有胎生鬼也。餘皆化生也。

Regarding "ghosts encompass both womb-born and transformationally born": this is the next broader. That is: terrestrial rākṣasas and Hārītī are both womb-born. Thus a ghost mother said to Maudgalyāyana: "In the daytime and nighttime portions, I give birth to five hundred sons each; as soon as they are born, I eat them myself, and though I finish them, I am not sated." Therefore we know there are womb-born ghosts. The rest are all transformationally born.