The author complains that kids are learning coding tutorials - like angry birds ones on code.org. Having attended my (then 5yo) doing some of these I think the level is about right. Just like we don't force kids to read chapter books without illustrations at that age, 'horses for courses' as they say.
The angry birds type tutorials are a bit too closely lead buy they cover basic variable use and loops and such. They also show the JavaScript produced by the blockly frontend.
The objections seem a bit harsh given the target age ranges - if they're still using only blockly at 15yo then you would be right to worry IMO.
