It's not included in that list of banned episodes, because unlike those (the Porygon episode for example), Tentacool and Tentacruel did air on TV in the US before being banned.
It is a banned episode, because many felt it had too much of a connection to the September 11th attacks (the giant Tentacreul destroying buildings). As to my knowledge, it hasn't been shown on TV since then.
Another episode, The Tower of Terror, was also banned after September 11th because of it's name, but was later re-aired some time ago.