Fits for Scott Plasma Jg. 2018! This is indeed a good question! Scott Plasma frames do not fit the Elite Turno roller trainer, for example!

The frame or its composition is not important for compatibility with the Tacx Flux. It is more important to know what type of axle the bike has (quick release vs. thru axle) and that you are using a cassette that is compatible with the bike or its rear derailleur.