This is objectively not true. Netflix has put almost no tech into the basic tooling of modern day TV/film (i.e., the cameras or audio equipment) or the software used to produce the content, or even the tech used to create the sets, makeup, CGI, or any of the other actual work that goes into producing the content.
The only place where Netflix has put in more work is on the non-linear distribution side.
Netfix is way behind the big dogs in the live streaming space. Peacock...the smallest major streaming service... livestreamed dozens of Olympic sports simultaneously at HD and 4K resolutions to over a hundred million simultaneous viewers without issue. Netflix couldn't handle half of that traffic for a single boxing match without crashing or degrading the streams to CRT-era resolution. The biggest player in the live streaming space is Disney Streaming (fka BAMTech before its acquisition) which was created to create the technology to stream MLB games and now currently provides the technology for ESPN streaming, NHL, MLB, Blaze Media, and Hulu's live streams.
The difference is that Netflix's competitors don't brag about their technology.