Exactly why the term gentle parenting is meaningless.
Let's have a discussion about whether naughty step/time out is harmful or not - at least that's a concept people all know what each other is talking about.
There are gentle parents who use a version of time out/naughty step and consider this reasonable and gentle (in comparison to maybe shouting, hitting, chaotic discipline for example)
There are gentle parents who think it is harmful in all the ways outlined above. Often because of an overall philosophy about reward and punishment being a problem.
There are gentle parents who have come across the arguments about it being harmful but somehow think if you define it differently, don't use the words "time out" or "naughty" then it's fine because it's the labelling which is the problem.
Or that are very against time out/naughty step because of all the criticism they have read about it but they will happily use other punishments (e.g. related consequences) because they haven't read criticism about those.
Gentle parenting is a meaningless phrase! If I could banish one word it would be this one. I wish we could actually have an interesting discussion about whether or not punishment, time out, etc (in any form) is necessary, useful, harmful etc without it devolving into cirular "but that isn't gentle parenting" arguments.
I actually think most arguments about parenting come down to a clash in belief systems about whether you think children start out inherently selfish and need to be trained into being reasonable humans, ie behaviour is normal but needs to be actively curtailed, or whether you believe children inherently want to be good, and behaviour is communication that something is wrong. And the linked beliefs of whether parents ought to be benign dictators vs experienced mentors.
The mistake people make is assuming that "gentle parenting" occupies a specific place on these belief systems when IME it does not - there are too many different definitions.