Thoughts Too Deep For Tears

“After he had left them Jerry and Crispin sat in silence for perhaps an hour, full of what Alfred, Lord Tennyson, once described as thoughts too deep for tears. Of the...” so starts a paragraph in Wodehouse's The Girl in Blue around two-thirds of the way in. Plum as often kindled in me the curiosity (and exposed my ignorance) re. classical poetry. On google-searching, I found the term in question is from Intimations of Immortality from Recollections of Early Childhood by William Wordsworth. I think Plum–nearing ninety when he wrote Girl–confused it with Tears, Idle Tears by Tennyson. Or was it a deliberate faux pas, a magic realism ploy?