Took 2 seconds to find this in one of your sources that says that puberty blockers are fully reversible (the health line article):

Although puberty blockers are frequently described as “fully reversible,” more research is needed to fully understand the impact they may have on fertility. There is also little known about the drugs’ lasting effects on brain development and bone mineral density.

So they say they’re fully reversible yet don’t actually know 😂.

From the mayo clinic one:

Use of GnRH analogues also might have long-term effects on:

Growth spurts. Bone growth. Bone density. Fertility, depending on when the medicine is started. If individuals assigned male at birth begin using GnRH analogues early in puberty, they might not develop enough skin on the penis and scrotum to be able to have some types of gender-affirming surgeries later in life. But other surgery approaches usually are available.

How on earth can you look at those “side effects” and come to the conclusion that they’re “fully reversible”? Having an pre pubescent boys micro penis isn’t reversible. Being sterile isn’t reversible. Having early onset osteoporosis isn’t reversible.