Of course legislators don't know every subject they legislate on, it's unreasonable to expect them to. They take specialist advice in each subject to reach a decision, and the problem in this case is that the majority bodies are against the change with only one body for it, the one that profits, so far from able to give a completely unbiased view.
In the circumstances the legislator's position is entirely understandable, albeit annoying to those of us strongly associated with e-biking.