I admit if I need to play that trill using the indicate fingering, yes, it would be more challenging than if the fingering is 13 24. Mr. Beethoven has such 2-note trill in the motif of his
Piano Sonata No. 3, which is quite easy to do; he was a pianist himself, and wouldn't write down what he couldn't do himself WITHOUT robotic training, especially that this is one of his early sonata (still similar to Mozart).