Pretty much official that Gengars evolved during the event will have the move but not 100%. I would just wait the few days at this point. Usually I think it’s silly saving Pokémon that may never have a CD or another year in the future. I think waiting 3 more days seems plausible
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Pokemon.com has said that evolving gives Lick/Psychic, which is an official source, but it's not Niantic, so there's still a chance the information is wrong. And it's not like you're losing anything by waiting until Saturday to evolve it.
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I would think it would not be a good idea for Niantic to make pokemon.com into an inaccurate source.
...but Niantic
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It's not unprecedented that two companies have communication problems about what to announce publicly. But combined with Niantic's other problems at communication, it sure doesn't help that we can't even 100% trust a source that should be 100% trustworthy.