That article doesn't apply to unvested RSUs: "put options are quite ineffective at reducing drawdowns versus the simple alternative of statically reducing exposure to the underlying asset. "

You can't statically reduce exposure to an unvested RSU.

Also, the article concedes that there is one case where puts are useful: "Put options may offer crash protection"

Most big companies that I know with equity-based compensation typically forbid any hedging of their stock, especially through puts. But assuming hypothetically this is not an issue, you could sell short your company's stock to reduce exposure to your RSUs vested in the future.