No, by "transmeds" she means:
'Transmedicalists, or “transmeds,” are those who fixate on acute gender dysphoria as a litmus test for “true” transness.Transmed Youtubers mock nonbinary people and gender nonconforming trans people as “transtrenders. ”The message becomes clear: the only “authentic” form of transness is one that can be diagnosed by rules set out by cisgender medical professionals.'
It's in the article just before this (which she means sarcastically):
'If we can only objectively prove, with clinical diagnoses and data science, that childhood gender dysphoria does or does not persist into adulthood, is or is not alleviated by medical intervention, then we can prove the “truth” of trans identity.'
As if clinical diagnoses and data science are bad things! Why would someone not want to be 100% sure about the efficacy of medical intervention before they embarked on that path?