Some of the modern SSD can be secure wiped because they have built in encryption that is always used, even without password. Then you just need it to be able to wipe the encryption keys, which it seems to be able to do without worrying about wear leveling. So if you get a modern SSD it is possible that you can securely "wipe" it, but it is a different sort of wipe than a HD wipe. With HD you are actually overwriting the data so it is not there at all when you are done, with SSD you overwrite only a tiny bit string but once that is gone your data is impossible to access by someone who cannot break AES-256 with a 256 bit truly random key.