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>without using the employer’s equipment, supplies, facilities, or trade secret information

Good luck trying to prove that against IBM's lawyers and patent portfolio.

Even mighty IBM's lawyers can be sanctioned for bringing a frivolous case out of thin air. If you're careful, you should be OK.

Do you have some examples of IBM torpedoing companies in California on this basis?

This is about individuals (ex-IBM employees), not companies.

That doesn't appear to be under California law; from his Wikipedia bio it sounds like he was in some state that allows non-competes like that.