This was an interesting question. Whether 'biased' is the right word or not is open to debate but I do sense a subliminal leaning.
Whilst there is a common denominator in almost all of us - gender dysphoria - it has many different manifestations. For me, for example, not a day goes by when I do not feel discomfort with my gender but this tends to be a feeling of having been cheated rather than an all out desire to transition. I have a 'male' role in society (whatever that really means) and the personal consequences of relinquishing that role many times outweigh the benefits I may feel as a result of transitioning.
That said, I am in total awe of others who post on this site who have taken the brave step and have blossomed as a result.
However, I do see the other side of the coin too. There are many in this community whose dysphoria has been so bad that, for them, transition is the only viable option. They have transitioned and are seeing first hand, the benefits to their wellbeing that this has brought. In many cases, of course, there has been an impact on their family life, career, etc. but their strength of character has helped them to concentrate on the positives. Inevitably, therefore, they are going to take the view 'come on in, the water's fine' or 'I tried what you're trying but it didn't help'.
So when we're faced with 'not for me but I respect your decision' v 'come on in'/'I tried', we're bound to sense a skewing of the debate. As other respondents have suggested, this probably points to unintentional bias rather than a deliberate attempt to take one side or another. That said, as the page banner proudly proclaims 'Transgender Resources', I don't think it's unreasonable to expect a bit of flag waving for the transition cause!