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Simplifies them to what? It means "go up a directory", but it has to go up starting from somewhere, right?
<anything>\..\ gets removed, regardless of whether <anything> exists or not.
So is the "ping http://evil,com" part there just to give it "something" before the \..\ or is it actually doing something?
The "ping http://evil.com " is there because if it were "ping 1.2.3.4" it would actually work as a proper ping command, and passing vaguely-sanitized user data after a ping command to cmd /c would be a common use case.
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