I wouldn't agree. The only 'personal' information you need to plug in is everything you find on your passport - its expiry date, where you were born, where it was issued and where you are resident (its only a couple more bits than you need to put into the other site) - and as a result you get a very accurate and detailed summary of what you need visa/passport wise.
Whilst the site you found is good as a summary, when travelling internationally you can never be too safe when checking document requirements and aside from the individual governments, who better to provide that information than IATA?