Well there must be some mistake in what he wrote, you don't have to 'wipe' the partition, merely remove the files (and directories if any) which you copied over before copying them back. When you copy the files 'back' they will be copied sequentially and thus be placed 'scattered' (as in position on harddrive, not fragmented file) with appropriate space left between them for possible growth without needing to fragment them.
This copy method can of course be done on Windows aswell, the only difference is that NTFS's file placement strategy generally results in more fragmentation over time than the strategies employed by Linux filesystems like ext(x). That said all filesystems get fragmented over time, no strategy can avoid this fully.
Also if your partition is very fragmented and you have many large files it can be faster to use this 'copy to another partition' method rather than using a defragmenter which will operate solely on the target partition and thus need to move many parts of files around in the partition to 'fit' in parts of other files. Of course using the copy-method requires you having another partition with enough free space so it might not always be a feasible option.