Azov and Right Sector wear Nazi insignia, have Nazi tattoos, and carry Nazi flags. They are Nazis.
Here's an old joke:
Q: What do you call a man sitting at a table with 10 Nazis?
A: 11 Nazis.
No, not ALL Azov members have Nazi tattoos. Not ALL Right Sector members wear Nazi emblems. But all the people in Azov and Right Sector know someone who does, and they stay in the groups.
Forensic evidence of the bullets say that it almost certian taht is was Right Sector weapons that shot the demostrators and lead to the Maidan Coup.
Right Sector made videos bragging about them being responsible for the violence at Maidan.
The rest is just quibbling over details. Nazis gonna be Nazis. My wife's family is all from Eastern Europe. The oldest generation were kids duringg WWII. When I asked them about Ukraine Nazis, the answer was, "Everyone knows Ukraine has a Nazi problem."