That doesn’t matter. You still have to use the naming schema as shown in that article.
If you have more than 99 episodes within one season, use 3-digit episode numbers in all file names – e.g. My Show - s01e003.mp4
Depends on your operating system.
MacOS has something built in.
On Windows you can install the Microsoft Power Toys which bring the Power Rename tool.
Or you can use Filebot in its manual mode