It 100% is actionable. Twitter is a huge plataform, and they have gone on record before denying they did it.
This isn't like a TV station refusing to air political ads, that's true. But it is kinda like if you ordered a marketing company to mail 100k letters to people to get them to vote and they took your money and sent only 1k and the rest were printed and then burned.
Not to mention, like I said, Jack has gone on record multiple times on multiple courts saying this did not take place. He can claim "oh I wasn't aware" but that shit won't fly against the employees who DID know and did it.