While Phinney and Volek always bang on about keto and make it seem much more complicated to reverse T2D than it actually is in practice( Virta has a service to sell after all). Dr David Unwin GP in his practice in Southport (UK) has a 50% remission rate through 'just' Low Carb. But how low to go depends upon individual patients.
My BG meter told me that I had to go almost to the edge of Keto (20gms to 40gms of carbs per day), but many others (in this forum) only need to get to somewhere between 50gms and 100gms per day.
It really annoys me when people make it seem seem harder than it actually is, because that can deter some people from even trying!