He's doing his job. I've used it to connect a new 2018 iMac to old Thunderbolt drives and use a 2011 iMac as an external monitor. No problem. I was a little concerned at first about the adapter's weight, which would wear out the connector and USB-C connector, but it fits snugly and securely, and routing the attached cable through the hole in the iMac's stand keeps the weight down. Yes, there are (much) cheaper options, but build quality is pretty good, and there are no compatibility or reliability issues.
Logitech HD Webcam C270: Crisp 720p Widescreen Video Calling & Recording (960-000694), Lightweight and Portable at 3.15 lb.
192 Review
Smartphone Samsung Galaxy A50 4/64 GB, 2 SIM, black
82 Review
Enhance Your Visual Experience with Logitech C260 Webcam
78 Review
Sennheiser PC 8 2 Cancelling Microphone
71 Review
PlexDisc DVD-R 4.7GB 16x Recordable Media Disc - 100 Disc Spindle: Reliable and High-Quality Data Storage Solution
11 Review
Sony 50DMR47SP DVD R 4 7GB Recordable
10 Review
π Smartbuy 700MB/80min CD-R Blank Data Recordable Media Discs - Pack of 100, 52x Speed, White Top
10 Review
Verbatim 4.7GB DataLifePlus DVD-R 50-Disc Spindle: White Inkjet Printable with Hub Printable - 16x Recordable Disc (95079)
10 Review