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It's really hard to grind the inside edge of a small diameter hole that has been torch cut. It was done the right (and hard) way for a good result.
Yes I would have used the torch for the hole but my skills with a cutting torch are like Team Sergeant with a handgun.
If any steel is going to be heat treated, it must be of the correct type, that is it must have enough carbon to respond. If you don't know what steel you have you run the very high risk of doing everything wrong if you just heat it up and quench it.
Are steel targets heat treated?
My instincts say NO.
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