Can't speak for any of the Haynes' bike manuals, but their Auto/Truck ones typically haven't been too bad for the easier maintenance. Mostly for folks that want to do their own oil and spark changes + other minimal maintenance, but some of the deeper maintenance is either left out or poorly presented. Unsure if that is intentional or not.
As I got older I felt I was wiser to get my hands on Factory Service Manuals as a much better substitute, though (let's face facts) the RE factory manual can be confusing about things like torques and assembly sequences. Some head scratching and referencing this forum have clarified a LOT for me.
It has paid some real dividends getting every manual Kevin had available before he shut down. Be nice if our hosts paid more attention to earlier models, but there's always Hitchcocks when you're in a bind, even with the constant issue with International purchases. Kinda wish they'd opt for PayPal and/or at least additionally show prices in different currencies.