I see Palmor already said what I was going to, that Topaz will still do stuff even when set to zero. It's just my $.02, but that image looks like it has effects *from* Topaz.
I like Topaz a lot and use it heavily, but I will say that on super high quality images, it can often DISimprove them.
I would suggest on an image like that you either 1) use the masking tool in denose, mask the bird, invert and apply the processing only to the background, or 2) forgo denoise and use LR. the new subject detection masking in LR is really nice, so you can mask the bird, process it as much or little as you need, copy and invert the mask and do whatever NR you want to the background. i'll often just crank the NR slider to 100 for the background. or 3) forgot NR all together. i find on super clean images, it can be unnecessary