Gabriel is breaking down the 70 septets (490 years).
Rashi explains verse 24 as follows: 70 years of exile that have passed from the Destruction of the first Temple until this vision, plus the entire 420 year period of the second Temple:
re your question, note it does not say "from the time that Cyrus said to return and rebuild Jerusalem".
And it doesn't say Dibbur - word. It says Davar - thing.
G-d can be the one who has decreed the thing, from the moment that the first Temple was destroyed, that Cyrus would become king 53 years later, and rebuild the Temple.
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