I have seen a number of articles on Ibn Ezra that quote a supercommentator known as "Jonah Filwarg" (usually just referred to as "J. Filwarg") who wrote a book known as "Bnei Reshef." Does anyone have info on who J. Filwarg was, when he lived, what Hashakfic and/or denominational sect of Judaism he was part of, and if he is accepted/respected by Orthodox Jewry?
The sefer was printed in 1900 Petrekov [Russia], to explain Ibn Ezra. He has number of approbations, of those I recognized the Tehila L'Dovid. The first pages of the book can be seen free on Otzar HaHochma here.