Milan Vader (who was very happy with his own race and said he enjoyed it) talked about this as well: he said during lunch/breakfast they were talking about it and said most riders would jump it. Van der Poel said he didn't, he'd go over the wood, but Vader told him that at the test event in 2019, they removed this before the race because these kind of wooden things are meant for training only, to get to know the jumps in a relatively safe manner.
"In the first lap I then saw that the wood was indeed gone and a few seconds later I heard people yelling behind me, then I basically knew what happened." he said. Of course he couldn't confirm, but when asked if he thought VDP knew about the wood being gone: "I can't really say, but....yeah I think so, because we talked about it this morning."