Puberty blockers ARE reversible and completely safe. They've been used to treat early onset puberty since the mid 1980s. The first use for trans kids wasn't until a decade later.
If you haven't noticed fascism and bigotry have been on the rise internationally for the last seven years. That explains your assertion about other countries "stepping back" from trans health care. Just in case you're either too unkowlegable or too blinded by ideology, let me put it in writing for you. As right wing politicians gain power in government, they make it harder for trans people in general and trans children in specific to access health care and live their lives in an effort to reduce/remove them from the population (AKA soft genocide).
I hope you hold the same views for ALL medical procedures. (tonsillectomy, wisdom teeth removal, cavity removal, broken bones, eye examination, vaccinations, cancer treatments, early onset puberty, diabetic treatments, to name a few) Otherwise you'd just be a hateful hypocrite. Oh, BTW, if a minor is "too young" or "too immature" to know what their gender identity is, then they're too young and immature to know what their sexual orientation is. Just sayin