Hi,
According to the footnote, the temperature rise current is the current value that the inductor would rise in temperature to 50 degC from Ta=20 degC. 50 degC isn't that much of a temperature that the inductor is not supposed to withstand.
The saturation current would have the inductance drop to 65% of its nominal value. That's to say that a high (in fact destructive high) current will flow. That's what you want to avoid.
It depends more on where the product with the inductor will be used. If in an area with significant amount of ambient heat like industrial environment or automobile, then I'd say you stay below the temperature rise current value as the temperature will go higher than additional 30 degC. If it's in a domestic environment, then you can go even above the temperature rise current value, but stay well below the saturation current value.
Okay, I see that the recommended operating temperature ranges up to 100 degC so it is not suitable for automobile application.