So it is possible. And for me the way to do it is simple.
You may also consider Bixby removed if you just throw the phone in the garbage. Some options are not possible for the great majority of people. The authors of Bixby and the makers of the hardware did not give any option to remove Bixby. I am sure their intent was to prevent its removal and therefore Bixby is not generally removable.
I bought this Samsung phone because I liked the prior Samsung phone that I had and I like this new phone except for Bixby. Bixby is a big deterrent to purchase. My next phone will not have an intrusive talking anything on it.
I too am a Bixby hater and go to great lengths to turn it off. I have many Samsung devices, and have been buying Samsung for years. In addition to Samsung phones, smart watches, I have smartthings with extensive sensors in two homes. Listen up Samsung, Bixby is changing this - it was time to buy a new tv, and I avoided buying Samsung because Bixby was integrated. I will not buy another Samsung phone with Bixby until it can be completely disabled, or better yet optionally installed. Don't become the next Beta max, I am not alone in this!