Yes. Since the rational soul cannot be produced by a change in matter, it cannot be produced, save immediately by God.
Quia anima rationalis non potest produci per transmutationem alicuius materiae, ideo non potest produci nisi a Deo immediate.
God alone can create; for the first agent alone can act without presupposing the existence of anything; while the second cause always presupposes something derived from the first cause, as above explained (Q75, A3): and every agent, that presupposes something to its act, acts by making a change therein. Therefore everything else acts by producing a change, whereas God alone acts by creation.
Solus autem Deus potest creare. Quia solius primi agentis est agere, nullo praesupposito, cum semper agens secundum praesupponat aliquid a primo agente, ut supra habitum est. Quod autem agit aliquid ex aliquo praesupposito, agit transmutando. Et ideo nullum aliud agens agit nisi transmutando; sed solus Deus agit creando.
Some have held that angels, acting by the power of God, produce rational souls. But this is quite impossible, and is against faith. For it has been proved that the rational soul cannot be produced except by creation (Q90, A2).
Quidam posuerunt quod Angeli, secundum quod operantur in virtute Dei, causant animas rationales. Sed hoc est omnino impossibile, et a fide alienum. Ostensum est enim quod anima rationalis non potest produci nisi per creationem.