it's given in the next few lines only of Chapter 13, Vayavivasamhita, Shiva Purana, When Brahma Created Vishnu. They are as follows.:
Now listen to their holy and wonderful story that releases from sins.
22-26. Listen also to what happened to Brahmā in his Kalpa. In the Kalpa, Meghavāhana, Viṣṇu became a cloud and showered the earth for a thousand divine years. Seeing this, Śiva gave imperishable Śakti to Viṣṇu. Obtaining the Śakti from Śiva Viṣṇu created the universe along with Brahmā. On seeing that glory of Viṣṇu, Brahmā created by him was seized by jealousy and said derisively. Go you, O Viṣṇu. The cause of your origin is known to me. Rudra is superior to both of us. There is no doubt in this.
It is due to the grace of that lord that you, the sustained have become a creator today.
I too shall propitiate Rudra, the leader of gods, by means of penance and shall create the entire universe along with you. There is no doubt in this.
Slighting Viṣṇu thus, Brahmā attained Śiva by means of penance and submitted to him thus.
O lord of the gods, O lord of the universe, Viṣṇu is born of your left and I am born of your right side.
Still Viṣṇu created the universe along with me. Due to rivalry he was taunted by me depending on the strength of your support.
“O Viṣṇu, your piety towards the lord is not more than that of mine” (I told him) because our origin from you is on the same footing.
O Śiva, it behoves you to give all that to me also in the manner you bestowed on him before due to his devotion.
Thus implored by him the merciful lord Śiva gave all to him as justifiable.
Thus obtaining the state of being the Atman of all in a trice, from Śiva, Brahmā hastened to and saw Viṣṇu.
36-41. He saw Viṣṇu lying on Śeṣa[1] in his abode in the milk-ocean.[2] A white canopy resembling the sun was spread. It was created by him mentally. It was set with gold and gems. Lord Viṣṇu had eyes resembling lotus. He had splendid body with four arms. He was bedecked in ornaments. He was holding conch and discus. His face shone like the disc of the moon. The scar Śrīvatsa marked his chest. He was smiling sweetly. His lotus-like feet attained red hue due to the contact of the lotus-like Lakṣmī. In Yogic slumber he appeared lying in the nectarine milky ocean. By the Guṇa of Tamas he was Kālarudra; by that of Rajas he was Brahmā; by that of Sattva he was Viṣṇu. In Nirguṇa state he was lord Śiva. On seeing him Brahmā spoke seriously—“O Viṣṇu, I am going to devour you as you did me formerly.”
On hearing this Viṣṇu woke up, saw Brahmā and smiled slightly.
In the meantime Viṣṇu was devoured by Brahmā and immediately created through the middle of the eyebrows.
44-47. In the meantime the moon-crested lord came to the place to test their Śakti. Though devoid of form he assumed a form in order to bless them as he had previously done. Both of them were delighted and frightened and so eulogised the lord and bowed to him with respect from a distance. The trident-bearing lord blessed them and vanished even as they watched him with respect.
So in the kalpa of meghavahana Brahma and Vishnu simultaneously created each other respectably. There may be other kalpas also where brahma created vishnu. As the verses of your question states clearly but this is only circumstance I found as of now where Brahma Swallowed Vishnu and created him again from the middle of his eyebrows as his son. So due to the boon given them by Mahadeva, the tridevs create each other in different different kalpas respectably. Period.