They did brother. I know some Sufis in India prior to the Afghani issues started had very Hanbali style ideas, but Ibn Arabi's Wahdathul wujud was always a pantheistic concept. That is the fundamental concept of Allah.
Brother I use to be obsessed with reading Ibn Arabi and sufi books in general. You don't understand it properly and I don't mean to be rude about that. But I've studied for so many years. There is a lot of hyperbola Ibn Arabi uses. I don't like Ibn Arabi too much myself, but he taught a lot of insights and his view is panentheism.
Pantheism - God is all things
Panentheism = God is all things + but God is beyond all things and transcends.
If you read his Fusus, he talks about how God is seen/not seen, manifest yet unseen, known yet unknown, with all creation, beyond all creation.
You aren't doing his works justice with this oversimplification.
Panentheism is a word that is underlined in red, because it's hardly known. It's pantheism but with addition God transcends.
There is three views when it comes to oneness of all things.
Monism (everything is one)
Panthesim (God is everything)
Panentheism (God is everything + transcends all things)
Ibn Arabi was of the 3rd view. Same with Rumi.