There are no honest public polls. They all are propaganda now. Conservatives don’t trust liberal pollsters and refuse to talk to them.
Actually, there are honest polls, although most of the good ones are not public. The ones we hear reported are, as you say, propaganda now. You cannot even look at trends because those are too sensitive to the low and variable response rates. Getting around the conservative reluctance to talk with pollsters is one of the biggest challenges in my (former) profession. It can be done, but it costs a lot, and the honest polls tend to be closely-held because of their cost.