Occam's razor here.. Polling failure and it's very clear from the actual amount of people voting for the guy. Yes you can make a conspiracy theory but it's a bit ridiculous.
Most Romanians that work in IT(and post here) live in their own bubble (because they make 5-10x average Romanian salary) and are totally disconnected from the common folks and can't now believe that the person making less than minimum wage that is serving their 3 euros expresso is not loving it.
Those common folks are similar to the rest of Eastern Europe with strict religious beliefs and very conservative so it's not a surprise they vote for someone that they resonate with.
Similar stuff happened in Brussels where a radical islamist party won seats in the parliament by using TikTok tactics. He did not show up in the polls either.