Negative.
That is not correct, and hence my earlier post about the conflicting information.
It would be REALLY nice if Zwift made this more clear in their description of how an FTP test works.
In both short, and long FTP tests you begin the test with a warm up in ERG mode that ignores terrain.
When the warmup ends it drops out of ERG and now you are using the terrain for the actual test.
Like Steve said earlier a big flat route if you have the chainring to support it, or a hill climb.
I think Road to Sky is the winner, but I’m not a super Zwifter so not sure of all the options.