Xert Fitness Test for Single-Gear Trainers

Is there a Xert Fitness Test specifically designed for AUTO/ERG mode?

I have a Wahoo trainer with Zwift Cog, i.e. only one gear, so I can only use Xert EBC in AUTO or ERG mode.

I want to determine my fitness signature using a fitness test.

I found “Xert Fitness Test for Breakthrough Version 3” - the description says “This workout is intentionally designed to help you achieve a fitness breakthrough on your smart trainer using trainer control.” Does it mean it’s for ERG? I’m not sure, because the description also has a #MIXEDMODE, and from what I understand, mixedmode is not ERG.