Is the 1DX Mark II the last Canon DSLR camera made with interchangeable focusing screens?

From what I can tell, the 5d3, 5d4, and the 1DX Mark III all have fixed focusing screens (from looking at the manual)

So if you want an officially-supported split-prism focusing screen for manual focusing through the OVF, the 1DX Mark II is the only available choice from Canon?

Does anyone have an EC-B screen? Does it work well?