At first I hadn’t seen the pdf you attached and only then realised it was a lactiflora you’re referring to. I don’t know that variety, but many others have red foliage when growing, but as far as I know all of them have their foliage turned green by the time they flower. In the shrubby section there’s Paeonia qiui which is known to have pretty red foliage for a very long time, but that one is very rare and expensive. Other lactifloras with pretty dark red foliage are ‘The Fawn’ and ‘Amalia Olson’. Both have nice red Autumn foliage as well, but in Summer they are green. Both are good plants as well with pretty flowers. There are undoubtedly others as well, but those two spring to mind.
Growing peonies for cutflowers in Belgium. Also hybridizing them.