The above foundation was founded by Prof. Karuṇesh Shukla who also published a handlist/catalogue of its manuscript collection. (I attach a partial scan of the catalogue --all that I have.)
The collection (of about 1k mss) was housed in Andhiari Bagh when I visited in 2022. After Prof. Shukla passed a couple years back it was moved --perhaps to Gorakhpur University, but I have no confirmation of this. Anyone info on what happened to the collection would be most welcome.
I should add that the collection does not contain many Buddhist texts, despite the name of the foundation. Its strongest area, as I recall, was grammar.