Full list of quotas and nominated athletes was posted by the FIL today: https://www.fil-luge.org/cdn/uploads/fil-luge-qualification-list.pdf
declines their quota in women’s singles, which went to
either declined their quota in men’s singles, or were never awarded one, thus giving a second quota in men’s singles.
I think the FIL interpreted their qualification document different than we had in mind. “If there are still remaining quota places that are not filled after applying D.2, quota places will be allocated to the next highest ranked eligible athlete/doubles team from an NOC that has not earned a quota place according to D.1…” My guess, based off the allocations made, would be that the FIL interpreted this rule as only unqualified NOCs could earn a quota through D.3. That would explain why and were seemingly passed over for men’s and women’s singles quota respectively. This clause explains how got that second quota in this case: “If there are still remaining quota places that are not filled after applying D.3.1, quota places will be allocated to the NOC with the next highest ranked eligible athlete/doubles team…”
Edit: This would also be the reason didn’t get a men’s singles quota.