I don't know that I would take that list as gospel though, my phone (Note 10+) is not listed as an approved phone, yet works just fine. Here is the current list per DJI:
Android V4.3.32
Requires Android 5.0 or later.
Compatible with Samsung S9+, Samsung S9, Samsung S8+, Samsung S7, Samsung S7 Edge, Samsung S6, Samsung S6 Edge, Samsung Note 8, Huawei P20 Pro, Huawei P20, Huawei P10 Plus, Huawei P10, Huawei Mate 10 Pro, Huawei Mate 10, Huawei Mate 9 Pro, Huawei Mate 9, Huawei Mate 8, Honor 10, Honor 9, Vivo X20, Vivo X9, OPPO Find X, OPPO R15, OPPO R11, Mi Mix 2S, Mi Mix 2, Mi 8, Mi 6, Redmi Note 5, Google Pixel 2XL, OnePlus 6, OnePlus 5T.
I would assume the Z-Flip is running a version of Android 10, so in theory should work fine. My only concern were it my phone would be if DJI Go 4 gets confused between the phone being a phone or a tablet. Certainly worth trying the software with props removed before flying.