Yes, but that is not evidence that a majority of those who take puberty blockers would not have been dysphoric post-puberty if they had not taken them.
Imagine that there are 120 children who are experiencing gender dysphoria.
Imagine that 100 of them go through puberty. 20 of those who go through puberty continue to experience gender dysphoria.
Imagine that 20 of the original 120 take puberty blockers, and therefore do not go through puberty.
Can we say that 80% of those children who took puberty blockers would have ceased to have experience gender dysphoria if they had gone through puberty? No. We are not comparing like with like.
The group of 100 children who go through puberty contains those for whom gender dysphoria will be permanent, and those for whom it will not be permanent.
The other group, the 20 who are taking the puberty blockers, does not necessarily contain the same range.
It is possible that those who are given puberty blockers are those in whom gender dysphoria appears more deep-rooted, who are therefore more likely to have continued to experience gender dysphoria post-puberty.
I am undecided about the issue of puberty blockers being prescribed to children experiencing gender dysphoria. If there is to be fruitful debate on this topic, then we need to be careful to not draw conclusions from the statistics that are not warranted.