No, the problem is the medias (and campaign strategists) didn’t even try to communicate on these policies, and again thought social progressivism alone would do. That worked for a time in the early 2010s but they have yet to realize that when there are economic troubles it’s not enough to win elections, as this vote demographics show. No need to insult the intellectual capacity of the other camp.
It's not an insult, and I wasn't addressing either "camp." It's an observation that most people don't have the interest or ability in understanding government policy, and there isn't a good way to communicate the facts of the matter in a way that's accessible to most people. This is a problem of the media, who want everything broken into 30-second sound bites; but of course the media don't exist in a vacuum: they serve the media consumer, who won't listen to anything longer than 30 seconds, which unfortunately isn't enough time to explain the relationship between tariffs and inflation.
Voters demand simple explanations for complex realities, and simple solutions to complex problems, and as a result, the successful politician must fabricate simple explanations and simple solutions, even if they're wrong.
But Democrats gave simple explanations: “Joe is the sharpest he has ever been, the economy is the best you experienced your grocery bill increase is in your mind, no need to hold primaries and have your opinion we know this candidate is the best, etc… and if you disagree with any of this your are not smart enough”. I’m harsh but as a non American leaning left economically I found myself in disagreement many times this pas year but any criticism was met with huge suspicion.
Sure, there were many mistakes made by the Democrats' campaign. In your examples, the problem is not that the explanations are simple, but rather that they are obviously wrong.
EDIT: For fun, let's contrast the attitude of each campaign to its detractors. The Democrats say that people who oppose their strategies are dumb. The Republicans say that people who oppose their strategies are Communist pedophiles who want to destroy America.