This 'fluke' is obviously an animal as I can see 'structure' through the outer 'skin'. The things in my stool do seem different:
-there seems to be no structure: it looks like 'salmon flesh', even when I damage one of them with a tiny tool. I do not have a microscope.
Besides there are very many of these (hundreds) in my stool, most of them very small like 0.5 mm. I also think I pass these already for a long time.