I don't see anything wrong with Twitter not tolerating people spreading the wrong election date because 'free speech, don't be so offended'.
Well there goes every political campaign ever.
All jokes aside, these days it doesn't matter if it's the media, the campaigns themselves, the supporters - it's not about the facts, it's not about anything real, it's just about spreading misleading shit faster than it can be fact checked.
It's an issue on the right, it's an issue on the left. One may be worse than the other, but it doesn't mean it's better, it's just marginally less shitty.
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posting #LetHerDecide memes is "clearly for the purpose of influencing an election," or is it satire? If that level of satire won't be tolerated, what will?
I'll take your word that most of the accounts in question did not spread the wrong election date. I guess Twitter saw that some were, and assessed that the accounts were part of some 'campaign' (because they're similar in appearance, creation date, etc.) and basically judged every account in that 'campaign' as one.
To answer your question, if I were Twitter and I suspected all the accounts were being operated by the same small group of people, then yes I would punish all the accounts including the ones that hadn't yet carried out voter suppression tactics.
If I saw they were posting very similar content, I'd suspect the accounts that hadn't spread the wrong election date were soon going to and not wait until they all did to get rid of them.