Why is it ironic? These people surely don't have a problem with getting the Trump's message in. And to read Trump's tweets, they don't even need Twitter account

Why is it ironic? These people surely don't have a problem with getting the Trump's message in. And to read Trump's tweets, they don't even need Twitter account. What they have the problem with is getting their own messages out, getting their own communications. Trump has nothing to do with it - his message is not the problem, he has the biggest megaphone in the world, anything he wants to be heard will be heard regardless of platform.