The only time the polls can be trusted is when they can be verified - just before the election.
Imo, the only time polls can be trusted is after the election, if the polling was at all accurate as proved by the election.
Otherwise, I suspect ALL polls to be playing the same perfidy they played in 2016. Report as polls what they want to be true, then try to tighten up to what might actually be true just prior to the election. Then make up excuses after the election and expect us all to forget before they start the same crap all over again.