This was in the related articles: https://www.tomshardware.com/peripherals/printers/brother-denies-firmware-blocks-third-party-toner-and-ink-use
And I believe them. The reddit post in Rossman's video was 3 years old. I have personally installed and updated 5 Brother printers in the last year and they all still run on 3rd-party toner.
Couldn't you just reinstall windows with an older ISO to bypass this? That's what I already do at work anytime I need to setup a new machine, gets rid of the manufacturer supplied ~~programs~~ bloatware. Plus Rufus has an option for triggering the bypass command automatically.