It doesn't matter if pollsters are on the left or the right, media organizations can tell pollsters what results they want, and the polls can be designed, and can design questions to get any results they want.
Likewise, they can target samples, and different different sample variants to a statistical degree, to get the results they also want. It is all very scientific these days.
No, opinion polls cannot be relied on in any way, shape or form.
The only polls that were ever in any way reliable were EXIT polls. But, as is so often the case, once these started showing that the establishment was committing fraud at the polls, they started discrediting the accuracy of these polls, even when they were done in the most rigorous and scientific way. . .
So, the upshot is, bad polls are pushed by the ruling authorities, good polls are now hidden and discredited.