Remembering a Hadith very accurately is one quality; being reliable in transmission is another.
A statement about excellent memory does not by itself establish the narrator's trustworthiness. Likewise, a statement about trustworthiness does not replace the separate requirement of careful preservation.
Keep the two qualities distinct.
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Ṣaḥīḥ li-Dhātihi: Two Narrator Qualities
Remembering a Hadith very accurately is one quality; being reliable in transmission is another.
A statement about excellent memory does not by itself establish the narrator's trustworthiness. Likewise, a statement about trustworthiness does not replace the separate requirement of careful preservation.
Keep the two qualities distinct.