I consider myself a (moderately) gentle parent too. What I am not, is a Gentle Parent. Gentle Parenting, as it is generally proselytised, is absolutist and restrictive and has loads of seemingly arbitrary rules with exaggerated pop psychology.
A couple of minutes of time out for an overexcited toddler? This is Not Gentle because it traumatically utilises Shame and Isolation.
A short stern few words for a boy who hits a girl in the playground? This is Not Gentle because it traumatically utilises Shame and besides this level of violence is Developmentally Expected. Remove him from his friends in the playground? Shame, Isolation, Trauma...etc.
When parents try, in good faith, to implement these absolutist rules, it often looks pretty permissive to outsiders. NB this is because they are doing it wrong and Not Truly Gentle Parenting (see above).
Gentle Parenting advocates also generally insist that any/all other parenting styles result in significant psychological harm, which I find implausible.
I'd say the same about so called Traditional Parenting too btw. Any model of parenting with absolutist rules is going to be hard to implement well.
I think good parenting (like good teaching) is flexible, adaptive, moderate, and uses a wide variety of strategies flexibly; this is because, I think, there's no one single good method.