AtD translation: his skepticism, which was seldom being addressed these days

[Mike Jing]

497.33   Cyprian stood in the evenings, at the Compline hour, just outside
the light cast from the chapel windows, and wondered what was happening to
his skepticism, which was seldom being addressed these days except by such
truly horrible specimens as the Te Deum in Commemoration of the Khaki
Election by Filtham, which—although in the hymn-writing trade botching a Te
Deum is thought to be next to impossible, the psalmodic formulæ being well
established, even unto what notes to end on—nonetheless, from its
stultifying length, in arguable violation of any number of child-labor
statutes, as well as a relentless chromaticism that might have made even
Richard Strauss uneasy, too “modern” to have retained any power to
penetrate and sacredly stun, it was already known among schoolchild
choristers from Stain-drop to St. Paul’s as “Filtham’s Tedium.”

Why is his skepticism only being addressed by these "truly horrible
specimens"? Are these the only ones he gets to listen to regularly? Since
they lack the "power to penetrate and sacredly stun", I assume they can't
really make him any less skeptical.