Some people on here clearly just disagree with gentle parenting, and that's fine.
But deliberately misinterpreting what's being said isn't really helping anyone.
Gentle parenting doesn't mean allowing children to do what they want or cajoling them into action. There are times when behaviour has to be stopped quickly because it's unsafe. There are always boundaries and limits.
As a very experienced school governor I would say that most classrooms actually practice gentle parenting anyway! Even more so when there are SEN children involved.
I think there's this ongoing confusion between permissive parenting and gentle parenting.
The explanation which is part of gentle parenting doesn't always happen right away.
No one is expecting a teacher to spend 10 minutes trying to cajole little Timmy into opening his maths book. There will be consequences if he doesn't do what he's asked to do - which is exactly what gentle parenting suggests.
Not everything needs longwinded explanations.
In the same example mentioned above where the child doesn't want to do maths and chucks his book around the class, taking the child out of the classroom and thereby sucking up extra resource etc would happen in every school I've seen. That's not because of "gentle discipline" - it's because you have an angry child and you're de-escalating the situation.
Later on you might have a discussion with the child and try to find out why they were so angry. Do they struggle with maths and feel stupid, so they're trying to avoid doing the subject? Is the behaviour part of a pattern? What's the reason for the extreme anger? And that's where the "gentle" element comes in - trying to establish a root cause for behaviours and not just assuming children are "naughty". And again, this follow-on analysis and communication with the child has been adopted by the schools I've been in and is considered as the gold standard for teaching.