Time to find yourself a new Honda mechanic, the one you got doesn't know these old bikes very well. But that isn't unusual, as most dealers won't even work on bikes older than 7-10 years. At a local dealer in San Antonio, they didn't even know what a CT-70 was.
As per the manual, splitting the rims IS how you remove a tire on these kinds of bikes. If the tire won't separate from the rim, try using a propane torch to heat the metal. If you keep moving the flame around the rim, you won't burn the paint and when you start to smell rubber, you can lay the tire on the ground and step on the tire and it should separate cleanly.
If you used tire irons like you will just scratch the paint and bend the rim.