Looks like the brick is holding the wood down. I think it's okay to stay in there as it will also prop the wood up on the angel that he has going.
Depending on the substrate I would probably make the area under the brick complete inert though (use just plane gravel under it) to avoid dead spots in the substrate.
After the plants come in the brick should be well hidden, I mean he has a sword there now so that brick is gonna get hidden, haha.
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