Hi
The site is basing the recommendations on the standard VW specs for those years and also where the car might have a DPF or long life servicing. As far as I am aware, the
Ibiza won't have a DPF, so the site is recommending a 507.00 oil as it may be on a long life service schedule. If it's not on a long life schedule, there would be no issue in using one of the 505.01 oils in that as well.
Cheers
Tim