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That mod creates it's own parent for those floors and doesn't call on the vanilla floor base. From what I can see this mod here patches the vanilla base and adds it's own needed terrain affordance to it. Naturally a modded floor base woudn't get patched.
For a quick and dirty work around, just find where outland has it's floor base, then add "Plitka" into that list. It'd probably look like this:
<affordances>
<li>Light</li>
<li>Medium</li>
<li>Heavy</li>
<li>Plitka</li>
</affordances>