Yes, I have. They carpet over the base mount then you get a space of carpet which is not a solid base.
Remove the table, then remove the post. I would use penetrating oil to get into the threads. The base on the floor and the post are plastic threads. The post and table top are just pressure. Penetrating oil and a strap wrench should get them apart. You can cut away the carpet around the base which is a square counter sunk plate made out of aluminum with a female thread.