Has there ever been a fix? I have the same issue, entire airport is "sunk" down
It's not possible to reply to your question, without knowing which simulator you use.
This thread is about P3D V5 so, assuming you didn't enter into it with an FSX problem, if you read the previous messages, you would have known the fix for P3D V5 has been released a while ago on FSDT Live Update.
If, instead, you entered as an FSX user in a V5-specific thread, if you read the previous messages, you would have known the P3D V5 fix doens't work on FSX, and requires reverting to the previous version of the files, which has been posted eariler in this very thread.
And if you read my last reply, you would have known that, if you still have elevation issues, regardless of the sim, they might also be caused by another scenery, usually OrbX stuf that is known to cause elevation issues to airports, and sometimes come with fixes to undo the damage they did, or have specific utilities to exclude some airports for being affected by their product.