If the question was "Did Trump block someone because they made a joke about ice cream?" it would be off-topic, because it is about the motivation of an individual, and we can't ever know.
If the question was "Did Trump (or his social media assistants) block VoteVets? And I won't accept a screenshot as sufficient evidence." it is probably on-topic, but it will never get answered, because Trump is incredible unlikely to comment on it, and no-one else will be able to provide evidence you trust.
If the question is "Does Trump (or his social media assistants) ban a lot of people?"... it's a bit vague. Can we find someone who says he blocks "hundreds" or something more specific? That again, would be on-topic, but hard to answer.