It's seemingly not an uncommon pattern in electronics related hobbies, you'll have a few main forums with their own orthodoxy, and a banned former member who disagrees, and clearly has at least a good idea what they're talking about.

For instance, rc multirotors has "timecop", who was banned from rcgroups. He designed a flight controller which is popular and well thought of. AIUI, he also did the hardware design for what are probably the most recommended enthusiast motor controllers today.