My list of less expensive streamers would include the Sonore products, the Volumio Rivo and Rivo+, Holo Red, Pro-ject Stream Box S2 Ultra, and a few others, but would not include the Cambridge Audio and Bluesound, fwiw.
To be clear, there are $5k, $10k and $20k streamers that are well engineered, and do what they’re supposed to do, which is move a digital file from a source to your dad, without adding a material amount of noise. That’s it. You just don’t have to spend that much to achieve that result. (Btw, I would never advise you purchase a product that combines the server and streamer function into one product. That creates potential noise issues that require more money to be invested to mitigate the noise.)
There is one mainstream audio magazine - HiFi News - that does a pretty good job of producing standardized measurements for streamers to evaluate their noise (or lack thereof). In the interest of brevity, I’ll just encourage you to read the full thread I previously provided a link to. But to answer your question, yes, there is a huge amount of misinformation in the marketplace and among our fellow enthusiasts about streamers. I’ve been streaming for over 20 years, and it’s just gotten worse over that time.