In all my years’ work as a professional editor I’ve never come across THIS particular misunderstanding, ErictheRed!
Your claim that Smyslov_Fan’s original sentence does not represent the passive voice is indeed correct, but the same is also true of both the sentences you give at the bottom of your post! In the first of these, the verb “is … reading” (the adverb, “quietly”, is an irrelevance) is active, and the tense is present continuous (as opposed to the simple present, “reads”). In the second, the verb, “sits”, is also active, and its tense is simple present (as opposed to the continuous present, “is sitting”). (The adverb is, again, an irrelevance, as is the participle “reading”.)
Your misunderstanding appears to arise from a confusion between, on the one hand, voice and, on the other, aspects of tense. They are two separate things!
Here is an example of the active/passive distinction:
Your dog bit me. [active]
I was bitten by your dog. [passive]
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