Like, what is your version of what’s happening that polls aren’t reliable now?
Didn't they explain?
In this case it’s clearly biased against people who don’t answer random numbers. The “not answering” cohort may be correlated with other population groups like people with higher education and higher earnings. The survey may be systematically missing this chunk of the population, making the results biased too.
Higher educated democrats not surveyed -> the survey misses their opinions -> the survey is wrong when the results come in at election time.