In November they did announce they were closing on Sundays due to budget cuts [1]. From what I can tell, that went into effect in mid-December [2]. The budget cuts were reversed last week [3]. So as far as I can tell, they were in fact closed for awhile.

1. https://www.nypl.org/about/service-impacts
2. https://www.cbsnews.com/newyork/news/due-to-budget-cuts-new-york-public-library-no-longer-open-on-sundays/
3. https://www.thirteen.org/blog-post/new-york-city-budget-address-2024/