Wind driven snow and drifting will continue to bury things. Check out the South Pole Topography post (and the rest of the blog) https://brr.fyi/posts/south-pole-topography

Yes it does, and the process of regular re-raising it is fascinating.

Given that sea levels are rising, it seems that mean snow and ice levels should fall. So on average, foundations should get more exposed rather than buildings getting buried.

Varies by location, it seems the south pole isn't warmed up enough yet for that to happen. Big chunks are melting and drifting off though.

You do realize averages don't imply anything about local conditions?

I'm sorry he won't be able to reply, he drown in a pond that was on average 2 feet deep.

Yes, but this seems to be a problem at every Antarctic base I've read about.

The buildings are themselves grounded in snow, I imagine there's a sinking effect

And, where is the septic tank?

Here is the wastewater treatment plant at McMurdo. https://brr.fyi/posts/wastewater-plant