My console says
[22:46:12] [Server thread/INFO]: Saggins issued server command: /lift
[22:46:12] [Server thread/INFO]: Scan floor block type: IRON_BLOCK
[22:46:12] [Server thread/INFO]: [Lift] [DEBUG] Floor added at lift: Location{world=CraftWorld{name=world},x=-144.0,y=65.0,z=-115.0,pitch=0.0,yaw=0.0}
[22:46:12] [Server thread/INFO]: [Lift] [DEBUG] Floor y: 65
[22:46:12] [Server thread/INFO]: Scan floor block type: GLASS
[22:46:12] [Server thread/INFO]: [Lift] [DEBUG] Floor added at lift: Location{world=CraftWorld{name=world},x=-144.0,y=73.0,z=-115.0,pitch=0.0,yaw=0.0}
[22:46:12] [Server thread/INFO]: [Lift] [DEBUG] Floor y: 73

No, they don't.
The signs don't have anything written on them (after right clicking) and pressing the button doesn't do anything.

also [22:54:04] [Server thread/INFO]: [Lift] [DEBUG] Floor added at lift: Location{world=CraftWorld{name=world},x=-148.0,y=71.0,z=-98.0,pitch=0.0,yaw=0.0}
[22:54:04] [Server thread/INFO]: [Lift] [DEBUG] Floor y: 71
[22:54:10] [Server thread/INFO]: [Lift] [DEBUG] Redstone scan of CraftBlock{pos=BlockPosition{x=-148, y=71, z=-98},type=STONE_BUTTON,data=Block{minecraft:stone_button}[face=wall,facing=west,powered=false],fluid=net.minecraft.server.v1_14_R1.FluidTypeEmpty@42b02722}
[22:54:10] [Server thread/INFO]: [Lift] [DEBUG] Redstone scan no match