Twrp mi 8 Explorer edition


"They" are not, because they don't made the TWRP ... I doubt somebody will build a working TWRP for EE, because it is not common enough
 
You can Use the TWRP from MI8 and then you only have to edit the updater script in the custom.rom.zip

0. Use "MI8 TWRP" on "MI8 Explorer Edition" and install custom ROM
1. open downloaded custom "rom.zip"
2. go to -> \xiaomi.eu_multi_MI8Explorer_V10.0.4.0.OEHCNFH_v10-8.1.zip\META-INF\com\google\android\
3. edit -> updater-script
4. change -> getprop("ro.product.device") == "ursa" to getprop("ro.product.device") == "dipper"
5. enjoy :)