Sadly, it's not possible to "delay puberty" until later in life without permanent consequences. Puberty cannot simply be resumed later. Puberty blockers alter hormones dramatically during critical growth phases. The changes can't be reversed later as if hormones were not altered during critical phases if the person changes their mind.
It is absolutely possible, and it has been done in cisgender children with precocious puberty for decades.
> Puberty blockers alter hormones dramatically during critical growth phases.
Which is generally the goal. It is of course not possible to retroactively have allowed puberty to progress as though the blockers had never been taken, but it is possible to cease the blockers and allow it to resume, again, as is done for cisgender children who take them.
It almost feels like you're arguing definitions.