I went back and found that post. The recommendation was made by Moon1234.  As far as I can tell, he has not posted on ComputerTalk since 2018. (Maybe he still reads though.)

Whether you want to try to reach out to him.... that would be up to you.

I recently bought a Canon MF644cdw.  I have been buying Canon brand toner, so I can't help with your question.  I did do a search for toner, and I did find generic toners. I see what you are driving at with your question.