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It's an action taken on the spot, a plan not put into effect until the time arrives. Same with Eva's and Hideyoshi's the door was probably solid when Genji and Kanon were knocking on it. That is when The killer/accomplice's time limit started, unlock the door, remove the trap if the accomplice or escape as the killer, create the hole, seal the door and presto. Locked Room. The reason the second board's seal was done sloppily was because there was little time, Beatrice was still in charge due to hallucination of any explanation, but was quickly running out of time in order to move freely. Another way to explain it is to have Genji and Kanon merely lie but that would be too simple and it would create a bunch of unccessary holes.
As for the Red who knows what Beatrice is thinking, but she can create loopholes around Red to deceive it's victim. The panel CAN be called called a means of entry because it is a method of entry into a room or a way to close it.
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