These bits are unchanged until another file occupies the same space overwriting the bits. The actual data itself, the 0's and 1's that makes up all data called bits, is still on the device. To make a long story short, it tells the file system that the file no longer exists so the space on the storage device which the file's data occupied becomes available space. Remove (rm) doesn't remove the file, it removes the link. This has not changed, even in El Capitan. Moving a file to the trash then emptying the trash has the same effect as using rm in terminal.
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