I would consider neither [1] nor [2] to be of any scientific merit.

=== [1] ===

I find your reference [1] to be incredibly intellectually dishonest:

I agree with the initial paragraph that "gender dysphoria" as well as "dysphoria" in general are not well defined terms. Obviously, I was then expecting a definition by the author, but none was given. Instead, the author moves on to use the term as if it was a well-defined scientific thing.

The list of symptoms that follows is so overly generic as to be useless in practice:

1. Continual difficulty with simply getting through the day

That's called depression.

2. A sense of misalignment, disconnect, or estrangement from your own emotions

Usually called borderline/mania

3. A feeling of just going through the motions in everyday life, as if you’re always reading from a script

My feeling after a day of reading mathematics papers.

4. A seeming pointlessness to your life, and no sense of any real meaning or ultimate purpose.

I've heard that a lot from people who studied languages and then ended up working as a supermarket cashier.

5. Knowing you’re somehow different from everyone else, and wishing you could be normal like them.

I believe everyone has these feelings during puberty.

6. A notable escalation in the severity of these symptoms during puberty

Since you just described common puberty side-effects in #1 to #5, this is not an independent symptom anymore.

7. Attempting to fix this on your own through various coping mechanisms.

Reminds me of guys who are awkward at dating and try to push through by getting drunk.

8. Substantial resolution of these symptoms in a very obvious way upon transitioning, particularly upon initiating HRT

That sounds like "try hormone therapy to see how you like it".

After reading the article, I had a strong feeling that the author is probably selling related drugs and has a financial incentive to classify everything as trans symptoms. And while the author is describing herself like a researcher in this article, she's calling herself "adult demon anti-cis pro-trans activist" elsewhere and she has made this statement:

"I don't see a problem with telling straight guys who are exclusionary of trans women partners that they should try to work through that" Which I find incredibly ignorant and selfish, considering that many men plan to have kids the traditional way and for that goal you necessarily need to exclude trans women partners.

=== [2] ===

Your reference [2] appears to be a bit more scientific at first, but they published in the "highly prestigious" journal "Federation of European Neuroscience Societies and John Wiley & Sons Ltd" which allows anyone who is willing to pay the fees to publish practically anything. As such, the article has exactly 2 citations, both of which have shared authors.

They defined "gender dysphoria" as "An experience of incongruence between gender identity and birth‐assigned sex", meaning their working definition is based purely on self-reported feelings after the fact and, therefore, unsuitable for any scientific analysis.

Plus, the peer review for [2] is online here: https://publons.com/publon/10.1111/EJN.14420/
and you can see that their paper was rejected in the first round with the comment:

When we think of the manuscript as a whole: is there a clear and proven evidence of a "cerebral signature of gender dysphoria"? Please consider revising.

But then it was approved later on by the "co-Editors in Chief, EJN", meaning by the people that get paid from the paper printing fees... That looks like the kind of fake review cycle that I would expect from a pay-to-publish journal.

To sum it up, the fact that this uses scientific terminology and is published in a journal doesn't mean anything. It would only have meaning if it was either well-cited or published in a journal with critical peer review.