The link you provided is not accurate from my experience. I have three (3) TCL Roku TV's that have updated to Roku OS Version 10. The original blog post and your support link posted state that with OS Version 10 there is an option to view ALL CHANNELS, RECENT CHANNELS or FAVORITE CHANNELS. I have not found an option through the menu system or within the LIVE TV GUIDE that allows you to create a list of FAVORITE CHANNELS. There are only two VIEW options in the LIVE TV GUIDE. They are ALL CHANNELS and RECENT CHANNELS. No FAVORITE CHANNELS view is available.
It still baffles me why Roku removed the ability to mark channels as favorites way back in OS Version 6 or 7. Why would you not allow your customers to create their own FAVORITE CHANNELS list? Why is there a reference to the ability to create FAVORITE CHANNELS in your support post link above and in the blog announcement for OS Version 10, but it doesn't appear to be available? Is this ability to create a list of FAVORITE CHANNELS limited to only select models of Roku TV's?
TCL Roku-TV 55P605 (4K/HDR/DV) | VIZIO SB36512‑F6 ATMOS Soundbar | Fire TV Stick 4K TCL Roku-TV 43S425 (4K HDR) | Fire TV Stick 4K TCL Roku-TV 32S301 (720p) | Fire TV Stick 4K YABER Y31 1080p LED Projector | ONN 5.1.2 Dolby ATMOS Soundbar | Fire TV Stick 4K