It's a bit more than a CLA as they are doing the rangefinder repair. They are inspecting the rest of the camera so will advise if anything else needs repair or replacement.
Clean, Lubricate, Adjust...a general checkup for proper function with adjustment as necessary (e.g. meter, focus accuracy, shutter speeds) and lubrication as necessary.
In view of the fact that CLA was over $100 30 years ago, $220 seems quite reasonable today. Inflation would account for a much higher fee...a Cost of Living calculator puts $100 1980 dollars as about $290 today.
There's not a lot of resources for Bronica repairs these days, especially for the RF645 which is all-electronic. Is this estimate from Tamron? Sounds like a reasonable price for what they've listed, especially since the bodies are still worth $500 and up.
Tamron recently replaced my RF645 back door which had a broken hinge, and also checked the camera's overall function, for about $180. I'd think repair and adjustment of the RF would be a bit more involved and costly. My RF645 is one of my favorite cameras, so it was worth it to me to keep it running.