RS485 slew rate limiting remove need for termination
Slew rate limiting helps, but does not remove the problem. It might allow a bus to run at low speeds without termination.
Short buses will most likely work without termination, but it is not recommended. So it all depends on how long or short your bus is, what is the slew rate, and what is the baud rate.
It will only work if all transmitters have slew rate limiting. If one transmitter only has slew rate limiting, it cannot do anything about the slew rate of other transmitters.