Affinity Photo videos were very impressive.
Yes, their implementation of a well-known solution toward the removal of raster (or other repetitive) patterns, is quite nice (with adjustable preview). Most of the controls and functions are very well implemented, and it helps that AP works with floating point precision and makes use of GPU processing for many of its internal operations.
It also works on selections, so one could, for instance, select bright regions like sky and cloud, or shadow regions, or colors, or subjects, and optimize the "denoising" for those specific areas of interest. It also handles different raster frequencies or rotations by individual color channel, so one does have a reasonable chance to fill in the blanks (even in problem cases).
Cheers,
Bart