Generally, the same places that will teach you how to repair a Briggs and Stratton lawnmower in six weeks of correspondence will also teach you to repair a motorcycle. Motorcycles are about a generation behind cars in technology; fuel injection became a thing in the past five-ten years or so. And we're talking EFI, not "in the combustion chamber magic" like most auto manufacturers are doing now.
There's also a fine tradition of non-manufacturer parts, much like the auto industry backintheday. Everybody runs Keihin carbs or Bosch fuel injection. Fuel injectors are all Bosch or Autolite or whatever and even if they aren't there's a lot of interchangeability. When my needle valve crapped out on my Kawasaki KLR the cheapest (Keihin) part was for a Harley 883 sportster.
All that is the mechanical bits. The brains are no different. I have an app on my phone that, through bluetooth, will allow me to tweak the fuel curves on my ECU. Same app will tweak most anything modern from Triumph, KTM, Aprilia, Benelli, Ducati, Moto Guzzi, Gilera, BMW, CCM, Husqvarna & Morini. I honestly have no idea if Hondas are the same but I imagine it's about as tricky to get into.
The article is absolutely right about the quality of servicepeople available. It's abysmal. And you pay an assload for it because the market is so small. Want your oil changed on your Honda Fit? $37. Want your oil changed on your Honda VFR? Well for one thing the car shop won't do it. For another the local Honda motorcycle shop wants $137. You can go to the corner BrandX guys but they're still going to want $87.
And motorcycles are far easier to change the oil on.