The word clouds are interesting, but I don't think they indicate much beyond the fact that the leader of the party in government is always going to have had far more media coverage than the leaders of the other parties have had.
I do note though, that there are a lot of very negative words in Sunak's, and very little that express approval.
Also, that both the Labour & Libdem 'clouds' have the word 'fairness' on them, I couldn't find that anywhere on Sunak's.
I think the exercise would be more appropriate if done during a General Election campaign, towards the end, perhaps, when there would be a bit more equable media coverage of all the parties and voters would be thinking more about them than they would at other times.