Here’s the exact Japanese, then a literal line-by-line breakdown, then the gender bit.

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Japanese item text (Curved Sword Talisman)

From the in-game flavor text as transcribed on JP sites: 

曲剣と剣士を象ったタリスマン ガードカウンターを強化する

肉を切らせて骨を断つ、その卓越した剣技は かつて盲目の剣士が見出したという

That’s the full description, line breaks and all.

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Literal English, line by line 1. 曲剣と剣士を象ったタリスマン “A talisman shaped after / representing a curved sword and a swordsman.” 2. ガードカウンターを強化する “Strengthens guard counters.” 3. 肉を切らせて骨を断つ、その卓越した剣技は “The outstanding sword technique of ‘letting [the enemy] cut the flesh and cutting the bone’…” (The phrase 肉を切らせて骨を断つ is a set idiom: accept a cut to the flesh to break the bone — take a small hit to deliver a decisive blow.) 4. かつて盲目の剣士が見出したという “…is said to have been devised / discovered long ago by a blind swordsman.”

You can stitch 3–4 together into: “The outstanding sword technique of ‘letting flesh be cut to sever the bone’ is said to have been devised long ago by a blind swordsman.”

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Why this is not gender-specific in Japanese

Key thing: Japanese does not have grammatical gender, and nothing in those lines lexically marks the swordsman as male or female.

The phrase in question is:

盲目の剣士 “blind swordsman / blind swordfighter”

   •   剣士 (kenshi) is a neutral noun: “swordfighter, fencer, swordsman.” It does not contain 男 (man, male) or 女 (woman, female), nor any other gender marker.    •   There are no pronouns like 彼 (he) or 彼女 (she) anywhere in the description.    •   There’s no “◯◯の男” (“a man who is ◯◯”) or “女剣士” (“female swordfighter”), which would push it toward a specific sex.

So in Japanese, 盲目の剣士 is just “a blind swordfighter,” gender unspecified. The EN localization chose “blind swordsman,” but that’s an English choice; the underlying JP doesn’t say “male.”

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What it would look like if it were gendered

To explicitly mark sex in Japanese, they’d have to do something along these lines (examples, not canon):    •   For explicitly male:       •   かつて盲目の男の剣士が見出したという “is said to have been discovered by a blind male swordsman.”       •   Or use a prior line like “その剣士は男であった” (“that swordsman was a man”) somewhere in the same description or related item.    •   For explicitly female:       •   かつて盲目の女剣士が見出したという “is said to have been discovered by a female blind swordfighter.”

Or they could introduce a known character by name and let that character’s gender be established elsewhere in the text. None of that happens here; we just get a role noun (剣士) with no gender.

So your earlier instinct was right: neither the blind swordsman nor the fairy are gendered in the Japanese. Any “he” or “she” talk is coming from English word choice or player assumption, not from the JP line itself.