Are func_brush Detail props?

I'm editing a map and got far too many func_details in it. I set some to func_lod so that the map can compile again, without the "Error! Too many detail props emitted on this map! (64K max!)n" in the compile log. The lods were glitching a lot however, getting invisible on some angle, even if you're standing right in front of them, so I made them func_brushes. Now, the error returns and the map doesn't compile. Do func_brush count as Detail props? What can I do?

So removing Displacements instead of func_details? That's gonna be though, but at least I know what to do now. Thanks for your help!