Good Point, Tobias.
I just revised the post to remove the “fully” prefix.
A Sotapanna understands those qualities to the point that he/she would have avecca pasāda in the Buddha, Dhamma, and Sangha.
– Such a person would SEE (passati) that there is no other refuge than the refuge of Buddha, Dhamma, Sangha.
– But there is much more to REALIZE BY EXPERIENCE (i.e. to attain the paccavekkhana-ñana). That is reached at the Arahant stage.