The whole text, starting from the title, is "making it nice" in the modern tendency of some who like to imply that what was actually vile was "good" or "not so bad."
How many boys were taken? The OP text mentions hundreds, but that was after the point which was in Wikipedia specified as the "end of the system" (1) whereas:
https://en.wikipedia.org/wiki/Devshirme
"Shaw writes that their number was 30,000 under Suleiman the Magnificent" - that is, that was the size of the army.
More important:
"Devshirme[a] (Ottoman Turkish: دوشيرمه, devşirme, literally "lifting" or "collecting"), also known as the blood tax or tribute in blood,[2] was chiefly the practice where by the Ottoman Empire sent military officers to take Christian boys, ages 8 to 18, from their families in Eastern and Southeastern Europe in order that they be raised to serve the state.[3] This tax of sons was imposed only on the Christian subjects of the empire, in the villages of the Balkans and Anatolia."
"The ideal age of a recruit was between 8 and 10 years of age"
What's actually "not so bad" in taking the 8-10 years old children away to maintain the army of 30000?
Read the argument of the article:
"Beyond ‘slave soldiers’" "Essentially, they displayed their ‘slave’ status with pride" --- oh, that makes it OK then? The boys taken from their families when they are 8 to be slave solders for life, but "displayed their ‘slave’ status with pride" somehow is an argument that their status is "misleading, if perceived through the lens of our modern sensibility" (the article tries to argue). Really?
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1) Under the title of "Decline": 1638 or 1648 "In an order sent in multiple copies to authorities throughout the European provinces in 1666 a devshirme recruitment target of between 300 and 320 was set for an area covering the whole of the central and western Balkans." That was the "official end" according to Wikipedia: "only 300 and 320." Per year, or per month?