Is it a remix if I load someone’s model into Fusion, copy the dimensions of some parts of a model, then re-draw it myself with improvements?
A remix is using someone else’s model and making changes to it while keeping one or more parts from the original.
I wouldn’t consider your example as a remix.
That said, you would be using someone else’s efforts for your own gain.
A better example of your usage would need to be shared to provide advice to determine you are still at risk of benefiting from someone that could cause you legal issues.
At best it is cheating at worst it could be IP theft.