That would mean that he will be coming within two hours. If you want to say that he is arriving at 2 o'clock, you'd say, "Il arrive à deux heures."
According to the lesson, the à is not necessary.
But also :
If you want to say "he arrives at 2 0'clock" the à is required.
Il arrive à deux heures. -- He arrives at 2 o'clock.Il arrive d'ici deux heures. -- He arrives by 2 o'clock.
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