Trying to download the nrfutil executable file from "nRF Util" page at www.nordicsemi.com/.../nRF-Util for "Linux (x86)" fails.
It is expected that this downloads a binary "nrfutil-linux" file from developer.nordicsemi.com/.../nrfutil
However it shows as garbled text inside the browser:

Which is due to your website using value "text/plain; charset=UTF-8" for the "content-type" response header. As this incorrect header value tells browsers to expect plain text... which clearly isn't the case.
Instead your website should use the value "application/octet-stream" for the "content-type" response header, as that will allow browsers to know to download the binary as a file.
Please fix this on your website as it is hindering people to download and use the binary file as per your documented instructions.