English structures its meaning different from Greek. Greek uses the tenses of the verb - its morphology - when English uses a different word. Consider a few examples:
Hebrews 8:1-5 wrote:Κεφάλαιον δὲ ἐπὶ τοῖς λεγομένοις, τοιοῦτον ἔχομεν ἀρχιερέα, ὃς ἐκάθισεν ἐν δεξιᾷ τοῦ θρόνου τῆς μεγαλωσύνης ἐν τοῖς οὐρανοῖς,τῶν ῾Αγίων λειτουργὸς καὶ τῆς σκηνῆς τῆς ἀληθινῆς, ἣν ἔπηξεν ὁ Κύριος, καὶ οὐκ ἄνθρωπος. πᾶς γὰρ ἀρχιερεὺς εἰς τὸ προσφέρειν δῶρά τε καὶ θυσίας καθίσταται· ὅθεν ἀναγκαῖον ἔχειν τι καὶ τοῦτον ὃ προσενέγκῃ. εἰ μὲν γὰρ ἦν ἐπὶ γῆς, οὐδ᾽ ἂν ἦν ἱερεύς, ὄντων τῶν ἱερέων τῶν προσφερόντων κατὰ τὸν νόμον τὰ δῶρα, οἵτινες ὑποδείγματι καὶ σκιᾷ λατρεύουσι τῶν ἐπουρανίων, καθὼς κεχρημάτισται Μωϋσῆς μέλλων ἐπιτελεῖν τὴν σκηνήν· ὅρα γάρ φησι, ποιήσεις πάντα κατὰ τὸν τύπον τὸν δειχθέντα σοι ἐν τῷ ὄρει·
The details following the γάρ in those 2 intervening sentences is parenthetical, so can be skipped for the purpose of making this point. The use of the perfect in the phrase καθὼς κεχρημάτισται Μωϋσῆς gives the sense of "as Moses was (fully) aware (of this) because it had been revealed to him (by God)." In contrast to that, in Hebrews 11:7, the revelation to Noah comes as one of a few steps within a story;
Hebrews 11:7 wrote:Πίστει χρηματισθεὶς Νῶε περὶ τῶν μηδέπω βλεπομένων, εὐλαβηθεὶς κατεσκεύασεν κιβωτὸν εἰς σωτηρίαν τοῦ οἴκου αὐτοῦ·
The point of this is not to explain what Noah knew, but to explain what Πίστει "by faith" meant to him - he got a revelation that was contrary to his senses, he was a pious man, so he built the ark.
English might structure its meaning as "he was warned" - "he was aware of the situation", using two different words, but Greek uses the same word with different tenses to structure its meaning as χρηματισθεὶς (aorist) - κεχρημάτισται (perfect).
The tension between these two systems of with their different ways of constructing meaning becomes quite marked in a number of verbs; οἶδα is the perfect of a verb "to see", and means "to know", ie once you see, then you know. κτάομαι means "to acquire", while the perfect κεκτῆσθαι means "to possess". In many cases an overly grammatical understanding of Greek is possible in English, such as your "having loosened", but English often prefers other verbs , such as "take off shoes" - "be barefoot", rather than a cumbersome "having taken off their shoes". (ὑπολύω). So too with "tying". In Matthew 21:2, καὶ εὐθέως εὑρήσετε ὄνον δεδεμένην, the δεδεμένην could be rendered as "having been tied (onto something)", but perhaps English would be more comfortable changing the verb - "a tethered colt" might work.