Zoroastrian Literature Burning During Khulfa-e-Rashideen Era
attack on Persia can come under itmam hujjah as the letter a sent to persia. in return he killed the envoy If you read hole thing, it say that Rashidun caliphate are wrongly accused of such destruction. also Hazrat Umer has always been blamed for burning of libraries of alexandria etc with this famous quote mentioned in the link u provided. but scholar have debunked it and concluded this is also a wrong accusation.
Please also refer to the video below from 35:29 to 37:31 https://youtu.be/GQeBcdmkQFI?t=2129