Means nothing because it doesn't differentiate positive engagement from negative. Trump is so widely hated and mocked around the net that I'm not at all surprised he has a very high level of engagement.
I think you should read that article again.. it actually takes into account sentiment.
> But the entrepreneur admitted that there were limitations to the data in that sentiment around social media posts is difficult for the system to analyze. Just because somebody engages with a Trump tweet, it doesn't mean that they support him.