Just because one 700C rim and wheel will, doesn't mean that they all will be able to. So how can we answer your question of weight and e-bike motor?

You really need to get into the specifications of the components of your wheel to determine whether bike weight and your weight are any issue. Also, motors can put more torque into things than a person can, so things might simply wear out faster or present problems that the designers intending this to be for human powered use may not have considered.

It's partly why we see some things today that say they are for e-bikes.