Ahem. They also say guppies have a lifespan of one year. I may be mistaken, but I think they are not giving the poor guppies enough credit. I had a trio of them that lived for well over 2 years in my 10 gallon tank. Maybe it's because the owner of that site has never been able to keep them alive for any longer.
It also says that if male and female bettas are kept together the male will always kill the female. This is not always true. Males can be kept with females successfully, although this is rare, and sometimes it is the female that kills the male.
It says for dwarf gouramis that regular water changes are recommended. NO SH**.
It says that bala sharks grow slowly, reaching 20 cm in 2 to 3 years. As far as I know, balas get way bigger than that.
It also contradicts itself when it talks about the RTBS. First it says that it's not recommended for community tanks with smaller or weaker fish. Then it says at the bottom of the page that it can be kept in a community tank if plenty of over is provided for it.
Well I'm too lazy to look right now, but I'm sure there are a lot more.