I think that one is permanent double stick material to mount stuff in the shower or on the wall.
Here's one that uses CA to glue a screw head to the insert to pull it off. I assume the screw pulls off and the CA scrapes off OK, but he conveniently doesn't show that.
https://www.youtube.com/watch?v=9OApmoTqktA
And this one drills a hole in it (ugh!) that you can use to lube it afterwards
https://www.youtube.com/watch?v=iTQX1ycuZ_c