It was probably a plant. Remember this happening in Canada at the trucker protest? Someone had a nazi swastika flag, just one, and it was planted out of a window of a nearby building. It was used by Trudeau to smear those truckers and put an end to their protest.
The real nazi behavior from the real nazi Chrystia Freeland came afterwards by sending in cops and then canceling their bank accounts.
You might be right. I tend to think this reflects the honest opinion of many Polish farmers. Quite frankly, it probably reflects the opinion of a large percentage of farmers across all of Europe.