I didn't say anywhere that I'd 'just moved in, nor is the pipework 'very recent'. It's 5-6 years old I would estimate. You can see the notch on the second step where the other steps were, I removed those and then later 'fashioned' the 'taped' steps to at least be walkable. While it's great to establish some elaborate mystery story like you're catching people out in some way, you're not and it's not helpful. What I'm describing is the case. Maybe you can tell me why it wasn't specially noted on the inspection, but I'm guessing it's because at the point of sale, the soil pipe did not pierce the staircase because there was another rounded set covering it.
The WC floor is concrete.